研究者詳細 - 堀部　陽一

論文 - 堀部　陽一

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Synthesis of Carbon Nanowalls using Plasma-Irradiated Solid Carbon and Absorption of Cs in Water 査読有り国際誌

Fukada Y., Aoyagi Y., Yokoyama M., Horibe Y., Kano J., Kaneda M., Fujii T., Yoshigoe A., Kobata M., Fukuda T., Yoshii K., Ikeda N.

Journal of Electronic Materials 2025年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Carbon nanowalls (CNWs) are densely packed multilayer graphene sheets oriented perpendicular to a substrate. We developed a simple method for synthesizing CNWs without hydrocarbon gas. It was found that CNWs are formed when carbon plasma, generated by the impact of argon plasma produced by a microwave generator on a carbon source, strikes a substrate. The quality, size, and interlayer distance of the multilayer graphene constituting the CNWs were characterized using Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. We attempted electrodeposition of Cs from an aqueous solution into CNWs and successfully adsorbed Cs into them. The result of X-ray photoelectron spectroscopy measurement indicated that Cs was adsorbed between the layers of graphene that constituted the CNWs. We also found that increasing the electrodeposition time resulted in qualitatively greater adsorption of Cs between the graphene layers. This adsorption effect may be beneficial for applications such as purifying wastewater containing the radioactive isotope 137Cs.

DOI： 10.1007/s11664-024-11586-9

Scopus

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置換型ビスマスフェライトBi1－xRExFeO3(RE：Sm・Nd)における結晶学的特徴招待有り査読有り

堀部陽一, 小山泰正

まてりあ ( 公益社団法人日本金属学会 ) 63 ( 2 ) 103 - 108 2024年02月

Effect of isothermal annealing on formation of self-assembled nanostructures in manganese spinel ZnMnGaO<inf>4</inf> 査読有り国際誌

Horibe Y., Kawano I., Tamaoka T., Murakami Y.

Journal of Applied Physics 135 ( 4 ) 2024年01月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The effects of isothermal annealing on the self-assembled nanostructures of spinel manganese oxide ZnMnGaO4 were investigated using transmission electron microscopy and x-ray diffraction. The checkerboard nanostructures and zigzag nanostructures (named “Sierra” nanostructures) coexisted owing to the chemical phase separation of Mn3+ and Ga3+ ions by isothermal annealing at 575 °C. It was observed that the checkerboard nanostructures were dominant in short-time annealing and that the volume fraction of the Sierra nanostructures became more prominent as the annealing period increase. The interdiffusion of Mn3+ and Ga3+ is indicated to play an important role in gaining the total energy of the system by the reduction in the local strain caused by the formation of nanostructures. These results provide further insights into the fabrication of distinct types of nanostructures in complex transition-metal compounds.

DOI： 10.1063/5.0181172

Scopus

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Weak trimer distortion and planar spin configuration in hexagonal Lu<inf>0.6</inf>In<inf>0.4</inf>FeO<inf>3</inf> 査読有り国際誌

Cho K., Kamiyama T., Horibe Y., Park S.

Journal of Applied Physics 133 ( 19 ) 2023年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

Improper ferroelectricity and canted ferromagnetism in antiferromagnetically ordered hexagonal ferrites with A2-type spin configuration have been intensely studied due to their potential for room-temperature multiferroicity with strong magnetoelectric couplings. However, the subtle interplay between the magnetic structure and trimer structural distortion, which is a critical ingredient for ferroelectricity, has not been clearly verified in experiments due to the lack of control over trimer distortion. In this study, we report on Lu0.6In0.4FeO3, which exhibits weaker trimer distortion primarily related to the smaller tilting of the FeO5 bipyramids. The reduced vertical displacement of the equatorial oxygen of FeO5 located at the center of the trimer lowers the magnitude of the in-plane Dzyaloshinskii-Moriya vector component, resulting in the absence of canted ferromagnetism with the planar A1-type spin configuration, rather than the canted A2-type observed in other hexagonal ferrites. Our findings demonstrate that the degree of trimer distortion plays an important role in determining the spin configuration in related hexagonal systems.

DOI： 10.1063/5.0149942

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Control of nanostructures in manganese spinel oxide 査読有り国際誌

Y. Horibe

JSAP Review 2023 230404-1 2023年01月

Microstructure and Magnetic Characterization on Ball-Milled Fe-Based Nanocrystalline Alloy Sheet 査読有り

Nagata S., Horibe Y., Hiramoto S., Narahara H., Mori N., Sasaki I., Takezawa M., Ando Y., Shikayama T., Mukai S., Maeda S., Sakima S., Ishii T., Motozuka S.

Digests of the Intermag Conference 2023-May 2023年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

In this work, ball-milled iron (Fe)-based nanocrystalline alloy sheets and obtaining platelet particles are used to effectively utilize the end material and apply it to a soft magnetic composite. The instrumental analysis results reveal that, although a microstrain is introduced into the nanocrystalline α-Fe grains in the achieved alloy powder, the amorphous part filled among the grains experiences almost no change. The ball-milling treatment greatly increases the coercive force of the pulverized nanocrystalline sheet. Although the coercive force of the alloy powder decreases after the heat treatment, it remained approximately 10 times higher than that of the heat-Treated alloy sheet without the ball-milling treatment, even after the heat treatment. The magnetic process of the ball-milled and post-Annealed nanocrystalline alloy powder is discussed based on the results of the synchrotron radiation X-ray analysis and transmission electron microscopy with the Lorentz technique.

DOI： 10.1109/INTERMAG50591.2023.10265082

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Microstructure and Magnetic Characterization on Ball-milled Fe-based Nanocrystalline Alloy Sheet 査読有り国際誌

Nagata S., Horibe Y., Hiramoto S., Narahara H., Mori N., Sasaki I., Takezawa M., Ando Y., Shikayama T., Mukai S., Maeda S., Sakima S., Ishii T., Motozuka S.

2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings 2023年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

To realize the effective utilization of the end material and its application to a soft magnetic composite, Fe-based nanocrystalline alloy sheets were ball-milled, and platelet particles were obtained, in this work. Instrumental analyses revealed that although a micro strain was introduced into the nanocrystalline α-Fe grains in the achieved alloy powder, almost no changes were found in the amorphous part filled among the grains. The ball-milling treatment greatly increased the coercive force of the pulverized nanocrystalline sheet. Although the coercive force of the alloy powder decreased after the heat treatment, the coercive force remained to be approximately 10 times higher than that of the heat-treated alloy sheet without the ball-milling treatment, even after the heat treatment. The magnetic process of the ball-milled and heat treated nanocrystalline alloy powder will be discussed in detail in the conference based on the obtained results and Lorentz transmission electron microscopy.

DOI： 10.1109/INTERMAGShortPapers58606.2023.10228768

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スピネル型マンガン酸化物におけるナノ構造制御査読有り

堀部陽一

応用物理 ( 公益社団法人応用物理学会 ) 91 ( 11 ) 679 - 682 2022年11月

担当区分：筆頭著者,　責任著者記述言語：日本語掲載種別：研究論文（学術雑誌）

遷移金属化合物における自己組織化した異方的ナノ材料は，その物性の多様性と構造制御の観点から注目を集めている．通常，異方的ナノ構造作製のためには，試料作製条件の調整や高温処理が必要である．一方，スピネル型マンガン酸化物におけるナノメートルスケールでのスピノーダル分解を利用したナノ構造作製は，比較的低温での単純な熱処理のみで可能である．本稿では，磁性スピネル(Co,Mn,Fe)3O4において行われた研究例を紹介する．本系は遷移金属酸化物にもかかわらず，375℃という低い温度での熱処理によりMn-richな正方晶ナノドメインとMn-poorな立方晶ナノドメインが形成される．これらのナノドメインが複雑に相関し合うことでチェッカーボード型ナノ構造やラメラ型ナノ構造が出現し，磁性に影響を及ぼす．

DOI： 10.11470/oubutsu.91.11_679

CiNii Research

Inter-element miscibility driven stabilization of ordered pseudo-binary alloy 査読有り国際誌

K. Matsumoto, R. Sato, Y. Tatetsu, R. Takahata, S. Yamazoe, M. Yamauchi, Y. Inagaki, Y. Horibe, M. Kudo, T. Toriyama, M. Auchi, M. Haruta, H. Kurata, and T. Teranishi

Nature Communications 13 1047 2022年02月

Aligned Self-Organization Induced by Epitaxial Stress and Shear Deformation in Jahn−Teller Spinel ZnMnGaO4 査読有り国際誌

T. Horide, K. Morishita, Y. Horibe, M. Usuki, M. Ishimaru, and K. Matsumoto

The Journal of Physical Chemistry C 2022 806 - 814 2022年01月

Observation of Cu spin fluctuations in high-T<inf>c</inf> cuprate superconductor nanoparticles investigated by muon spin relaxation 査読有り国際誌

Winarsih S., Budiman F., Tanaka H., Adachi T., Koda A., Horibe Y., Kurniawan B., Watanabe I., Risdiana R.

Nanomaterials 11 ( 12 ) 2021年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

The nano-size effects of high-Tc cuprate superconductor La2−xSrxCuO4 with x = 0.20 are investigated using X-ray diffractometry, Transmission electron microscopy, and muon-spin relaxation (µSR). It is investigated whether an increase in the bond distance of Cu and O atoms in the conducting layer compared to those of the bulk state might affect its physical and magnetic properties. The µSR measurements revealed the slowing down of Cu spin fluctuations in La2−xSrxCuO4 nanoparticles, indicating the development of a magnetic correlation at low temperatures. The magnetic correlation strengthens as the particle size reduces. This significantly differs from those observed in the bulk form, which show a superconducting state below Tc. It is indicated that reducing the particle size of La2−xSrxCuO4 down to nanometer size causes the appearance of magnetism. The magnetism enhances with decreasing particle size.

DOI： 10.3390/nano11123450

Scopus

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Crystallographical and morphological changes in charge-ordering transition of RFe<inf>2</inf>O<inf>4</inf> (R: Y, Lu) investigated by transmission electron microscopy 査読有り国際誌

Horibe Y., Mori S., Ikeda N., Yoshii K., Maeno H., Murakami Y.

Ferroelectrics 584 ( 1 ) 20 - 30 2021年09月

担当区分：筆頭著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Temperature dependence of charge-ordered crystal structures and domain structures in RFe2O4 (R: Y and Lu) was investigated by energy-filtered transmission electron microscopy, combined with conventional transmission electron microscopy. The presence of three-dimensional to two-dimensional charge ordering transition were observed in both YFe2O4 and LuFe2O4 on heating. Furthermore, real-space images obtained with the energy-filtered transmission electron microscopy revealed that YFe2O4 has less anisotropic nanometer-scale charge-ordered domains than LuFe2O4. These findings in RFe2O4 indicate the importance of the interchange interactions between Fe-O bilayers in addition to those within bilayers in the structural phase transitions associated with charge ordering in this system.

DOI： 10.1080/00150193.2021.1984762

Scopus

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Amorphization under fracture surface in hydrogen-charged and low- temperature tensile-tested austenitic stainless steel 査読有り

A. Harada, K. Kusunoki, K. Moritani, K. Matsumoto, M. Hatano, and Y. Horibe

Philosophical Magazine Letters 101 40 - 50 2021年01月

Growth and anisotropy evaluation of NbBiCh<inf>3</inf> (Ch = S, Se) misfit-layered superconducting single crystals 査読有り

Nagao M., Miura A., Horibe Y., Maruyama Y., Watauchi S., Takano Y., Tanaka I.

Solid State Communications 321 2020年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 Elsevier Ltd NbBiCh3 (Ch = S, Se) misfit-layered superconducting single crystals were successfully grown using a CsCl/KCl flux for the first time. The obtained crystals had a well-developed habit parallel to the c-plane with a typical width of 1–2 mm and thickness of 10–40 μm. The superconducting transition temperatures with zero resistivity of NbBiS3 single crystals obtained from the nominal composition of Nb0.9Bi1.2S3 was 0.31 K, and that value of the NbBiSe3 single crystals grown from the stoichiometry composition (NbBiSe3) was 2.3 K. Sharp decreases in electric resistivity and magnetic susceptibility at approximately 3 K suggested a possible superconducting transition temperature of NbBiSe3. The normal-state anisotropy values of grown NbBiS3 and NbBiSe3 single crystals were 2.2–2.4 and 1.5–1.6, respectively.

DOI： 10.1016/j.ssc.2020.114051

Scopus

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Control of nanostructures by cooling rate in spinel-type manganese oxide ZnMnGaO<inf>4</inf> 査読有り

M. Ishimatsu, H. Tabuki, and Y. Horibe

Japanese Journal of Applied Physics 59 ( 105002 ) 2020年09月

Ferroelectric Sr<inf>3</inf>Sn<inf>2</inf>O<inf>7</inf>:Nd3+: A New Multipiezo Material with Ultrasensitive and Sustainable Near-Infrared Piezoluminescence 査読有り

Tu D., Xu C.N., Kamimura S., Horibe Y., Oshiro H., Zhang L., Ishii Y., Hyodo K., Marriott G., Ueno N., Zheng X.G.

Advanced Materials 32 ( 25 ) 2020年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Ultrasensitive and sustainable near-infrared (NIR)-emitting piezoluminescence is observed from noncentrosymmetric and ferroelectric-phase Sr3Sn2O7 doped with rare earth Nd3+ ions. Sr3Sn2O7:Nd3+ (SSN) with polar A21am structure is demonstrated to emit piezoluminescence of wavelength of 800–1500 nm at microstrain levels, which is enhanced by the ferroelectrically polarized charges in the multipiezo material. These discoveries provide new research opportunities to study luminescence properties of multipiezo and piezo-photonic materials, and to explore their potential as novel ultrasensitive probes for deep-imaging of stress distributions in diverse materials and structures including artificial bone and other implanted structures (in vivo, in situ, etc).

DOI： 10.1002/adma.201908083

Scopus

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Self-assembled lamellar-type nanostructure in manganite spinel (Co,Mn,Fe)<inf>3</inf>O<inf>4</inf> 査読有り

Horibe Y., Ishimatsu M., Takeyama S., Mori S., Kudo M., Auchi M., Tanaka M., Murakami Y.

Applied Physics Letters 115 ( 23 ) 2019年12月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 Author(s). Distinct nanostructures in (Co,Mn,Fe)3O4 were investigated using X-ray diffraction techniques combined with transmission and scanning transmission electron microscopy, as well as energy dispersive X-ray spectroscopy. The size of the checkerboard nanostructure increased with annealing, followed by the appearance of lamellar nanostructures comprising different types of platelike nanodomains because of nanoscopic spinodal decomposition of Mn and Fe ions. Remarkable local strain relaxation at the nanoscale associated with the domain size is suggested to play an important role in the stabilization of these checkerboard and lamellar nanostructures.

DOI： 10.1063/1.5123780

Kyutacar

Scopus

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Quadruple superstructure with antiferroic ionic displacements in B i1-x S mxFe O3 査読有り

Horibe Y., Nomoto M., Inoshita T., Watanabe K., Cheong S., Inoue Y., Koyama Y.

Physical Review B 100 ( 2 ) 2019年07月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

© 2019 American Physical Society. Crystallographic and morphologic features of quadruple and double superstructures in Bi1-xSmxFeO3 with 0≤x≤0.40 were investigated by x-ray powder diffraction and transmission electron microscopy. The presence of a quadruple superstructure accompanied by antiferroic ionic displacements was found near the morphotropic phase boundary between the R3c phase (0<x<0.10) and the Pnma phase (0.25≤x≤0.40). The quadruple superlattice phase coexists with a ferroelectric R3c phase at x=0.15. These superstructures were found to originate from the freezing of multiple phonon modes related to transverse wave ionic displacements. These findings provide further insight towards understanding the complexity of rare-earth-doped BiFeO3.

DOI： 10.1103/PhysRevB.100.024105

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Charged Domain Walls and Crystallographic Microstructures in Hybrid Improper Ferroelectric Ca3-xSrxTi2O7 査読有り

Nakajima Hiroshi, Shigematsu Koji, Horibe Yoichi, Mori Shigeo, Murakami Yasukazu

MATERIALS TRANSACTIONS 2019年07月

記述言語：英語掲載種別：研究論文（学術雑誌）

The charged domain walls in ferroelectric materials exhibit intriguing physical properties. We examine herein the charged-domain-wall structures in Ca3−xSrxTi2O7 using transmission electron microscopy. When viewed along the [001] axis, the wavy charged domain walls are observed over a wide range (>5 µm). In contrast, short charged-domain-wall fragments (from 10 to 200 nm long) occur because they are intercepted and truncated by the conventional 180° domain walls. These results reveal the unusual charged domain structures in Ca3−xSrxTi2O7 and will be useful for understanding their formation process.

DOI： 10.2320/matertrans.MT-MI2019006

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/130007681964

Effect of Ca doping on modulated structures in multiferroic Bi1-xCaxFeO3 査読有り

Hiroyama T., Hirata A., Inoue Y., Horibe Y., Koyama Y.

Journal of the Physical Society of Japan 88 054601 2019年04月

2.45GHz電磁波を用いたカーボンナノウォールの成長査読有り

青柳佑海人, 藤原孝将, 小椋裕美, 小野裕介, 大久保貴広, 大久保智子, 西川雅仁, 森正和, 堀部陽一, 仁科勇太, 狩野旬, 池田直

日本物理学会講演概要集 ( 一般社団法人日本物理学会 ) 74.1 ( 0 ) 1817 - 1817 2019年01月

マルチフェロイック六方晶マンガン酸化物における特異なドメイン構造　～透過型電子顕微鏡を用いたドメイン観察～査読有り

堀部陽一

セラミックス 54 99 - 102 2019年01月

コールドクルーシブル溶解法で溶製した高純度Fe-3 mass%Si合金の磁気特性と機械的特性査読有り

中川翔太, 渡辺稜介, 佐々木巌, 竹澤昌晃, 堀部陽一, 波多聰, 開道力, 小川俊文, 恵良秀則

日本金属学会誌 82 ( 12 ) 476 - 483 2018年12月

記述言語：日本語掲載種別：研究論文（学術雑誌）

Magnetic properties and mechanical properties of high purity Fe-3 mass%Si alloy by cold crucible levitation melting was investigated. The raw material of the alloy made from electrolytic iron and pure silicon with a purity of 99.99 mass% and 99.999 mass% in amount of impurities excluding Fe and Si were suppressed to 90 ppm or less. In the magnetic property, the iron loss of the alloy was reduced to a third of 35H210, a silicon steel sheet of the same Si composition commercially. This reduction shows the effect of high purity. In the magnetic domain observation, the equal behavior as magnetic properties was observed. In mechanical property, it proved that the high purity Fe-3 mass%Si alloy was easy to draw because the elongation of the alloy was higher than the commercially available silicon steel sheet.

DOI： 10.2320/jinstmet.J2018008

CiNii Article

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Magnetic properties and crystal structure of high-purity Fe-(6,6.5,7) mass%Si alloys 査読有り

Matsuyama K., Sasaki I., Nakagawa S., Era H., Takezawa M., Horibe Y., Hata S., Kaidou C., Ogawa T., Kubo S.

2018 IEEE International Magnetic Conference, INTERMAG 2018 2018年10月

Transport, magnetic, thermoelectric, and structural properties of hollandite titanates BaxTi8O16+δ 査読有り

Y. Yamashita, T. Okuda, S. Mori, Y. Horibe, R. Murata, and T. Katsufuji

Physical Review Materials 2 074409 2018年08月

遷移金属酸化物における相分離を利用したチェッカーボード型ナノ組織の作製とその特徴招待有り査読有り

堀部陽一, 森茂生

まてりあ 57 ( 6 ) 271 - 276 2018年06月

Peculiar Optical Characteristics of Different Silicate Source and Synthesis Technique in Europium Doped Li<inf>2</inf>SrSiO<inf>4</inf> 査読有り

Woo H., Horibe Y., Jha K., Jang K., Jeong J.

Journal of the Korean Physical Society 72 ( 11 ) 1350 - 1355 2018年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018, The Korean Physical Society. In this work, a silicate based phosphor doped with divalent and trivalent europium (Eu(2+/3+)) ions have been synthesized by two different synthesis processes, PGMS (propylene glycol modified silane) assisted sol-gel and solid state reaction (SSR) method. The structural, morphological and optical properties were studied in detail. The emission intensity of Li2SrSiO4:Eu3+phosphors synthesized through the PGMS assisted sol-gel increased up to 10 times more than that prepared by SSR method. However, Li2SrSiO4:Eu2+phosphor prepared by PGMS exhibited lower emission characteristics and decreased to one-third of that prepared by SSR. The Eu3+doped Li2SrSiO4synthesized by SSR method using different silicate (Si) sources revealed peculiar optical properties and this is the first kind of its report. The obtained results suggest that the optical properties of Eu(3+/2+)doped in silicate host can be regulated by the alteration of Si source besides sample preparation method. These results open a way to understand the mechanisms responsible for such optical properties and to develop new materials for white LEDs.

DOI： 10.3938/jkps.72.1350

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Electric property measurement of free-standing SrTiO<inf>3</inf>nanoparticles assembled by dielectrophoresis 査読有り

Budiman F., Kotooka T., Horibe Y., Eguchi M., Tanaka H.

Japanese Journal of Applied Physics 57 ( 6 ) 2018年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 The Japan Society of Applied Physics. Free-standing strontium titanate (SrTiO3/STO) nanoparticles (NPs) were synthesized by the sol-gel method. X-ray diffractometry revealed that the required minimum annealing temperature to synthesize pure and highly crystalline STO NPs was 500 °C. Moreover, morphological observation by field emission scanning electron microscopy showed that the STO NPs have a spherical structure and their size depended on annealing condition. Electrical properties were measured using a low-temperature probing system. Here, an electrode was fabricated by electron beam lithography and the synthesized STO NPs were aligned at the electrodes by dielectrophoresis. The conductance of a sample was proportional to temperature. Two conduction mechanisms originating from hopping and tunneling appeared in the Arrhenius plot.

DOI： 10.7567/JJAP.57.06HE07

Scopus

CiNii Article

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Effect of the size of the particles in a raw SiO<inf>2</inf>material on the optical properties of Eu(2+/3+)-Doped Li<inf>2</inf>SrSiO<inf>4</inf> 査読有り

Kim T., Namkhai P., Jang K., Horibe Y., Woo H.

New Physics: Sae Mulli 68 ( 6 ) 593 - 598 2018年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

© The Korean Physical Society. All rights reserved. Lithium-strontium-silicate phosphors activated with divalent or trivalent europium ions were synthesized through a conventional solid-state reaction method by using SiO2 with micron-size and nanosize particles as a silicate source. The crystal structures are almost the same in the samples prepared with micron size and nanosize SiO2. However, we newly found that the optical properties of Eu(2+/3+)-activated phosphors depended very much on the size of the particles in the raw SiO2 material adopted as the Si source. The maximal emission wavelength of the Eu2+-doped phosphor prepared with the micron-size SiO2 source was also revealed to be shifted to shorter wavelength by 13 nm as compared to that of Eu2+-doped phosphor prepared with a nanosize SiO2 source.

DOI： 10.3938/NPSM.68.593

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Size Dependent Magnetic and Electric Properties of Superoxygenated Free Standing La2CuO4 Nanoparticles 査読有り

Budiman Faisal, Horibe Yoichi, Tanaka Hirofumi

応用物理学会学術講演会講演予稿集 ( 公益社団法人応用物理学会 ) 2017.2 ( 0 ) 2817 - 2817 2017年08月

Crystallographic features of the state appearing in the multiferroic material Bi<inf>1-x</inf>La<inf>x</inf>FeO<inf>3</inf> around x = 0 20 査読有り

Yoshida H., Nomoto M., Inoshita T., Inoue Y., Horibe Y., Koyama Y., Koyama Y.

Materials Science Forum 879 2222 - 2227 2017年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2017 Trans Tech Publications, Switzerland.The simple-perovskite system Bi1-xLaxFeO3 (BLFO) is one of mixed-oxide systems having the multiferroic BiFeO3 as an end material, which shows the ferroelectric and antiferromagnetic orders in its ground state. Because of the paraelectric nature of LaFeO3 as another end material, the ferroelectric-to-paraelectric state change can be expected to occur in the mixed-oxide system BLFO. The interesting feature of BLFO is that there are both the PbZrO3-type and incommensurately modulated (IM) states in the intermediate La-content range between the ferroelectric-R3c and paraelectric-Pnma states. Although the detailed features of these two states have not been understood sufficiently, in this study, we focus on the IM state around x = 0.20, and have investigated the crystallographic features of prepared BLFO samples with 0.15 ≤ x ≤ 0.35, mainly by transmission electron microscopy. It was found that six kinds of superlattice reflections were, for instance, present in the reciprocal lattice of the state at 300 K for x = 0.20, in addition to fundamental reflections due to the cubic simple-perovskite structure. To understand the appearance of these superlattice reflections, we regarded the state as a modulated-structure state in this study. Concretely, the modulated structure was assumed to be characterized by the appearance of both the incommensurate wave with qI = <1/(4+δ) 1/(4+δ) 0>c and the commensurate wave with qII = <1/4 0 0>c in the normal-Imma structure. In addition, the appearance of the two modulation waves could also produce the superlattice reflections at the <1/4 1/4 1/4>c-, <1/2 0 0>c-, and <1/2 1/2 0>c-type positions in the reciprocal lattice. From the comparison with the experimental data obtained in this study, our modulated-structure model seems to be appropriate for the IM state in the vicinity of the PbZrO3-type/IM state boundary.

DOI： 10.4028/www.scientific.net/MSF.879.2222

Scopus

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Characteristic features of the modulated structure appearing in the multiferroic material Bi<inf>1-x</inf>Sm<inf>x</inf>FeO<inf>3</inf> around x = 0.15 査読有り

Nomoto M., Inoshita T., Inoue Y., Horibe Y., Koyama Y., Koyama Y.

Materials Science Forum 879 1393 - 1398 2017年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2017 Trans Tech Publications, Switzerland.In Bi1-xSmxFeO3 (BSFO) having the multiferroic BiFeO3 as an end material, when the Sm content increases from x = 0, it has been reported that the ferroelectric-R3c state is changed into the paraelectric-Pnma state around x = 0.14. The R3c/Pnma state boundary around x = 0.14 can be regarded as a temperature-independent morphotropic-phase boundary (MPB). The notable feature in BSFO is that, in addition to these two states, the antiferroelectric PbZrO3-type state was also found in the vicinity of the MPB. Although the PbZrO3-type state appears as a modulated structure, its detailed features have not been understood yet. We have thus examined the crystallographic features of prepared BSFO samples around x = 0.14, mainly by transmission electron microscopy. The PbZrO3-type state was confirmed to be present in samples with x = 0.15 on the basis of x-ray powder diffraction profiles measured from prepared samples at 300 K. On the other hand, the observation made by transmission electron microscopy indicated that the state for x = 0.15 is characterized by a coexistence state consisting of the ferroelectric-R3c and antiferroelectric PbZrO3-type states. In particular, the crystal structure of the PbZrO3-type state could be identified as a modulated structure with two transverse modulation waves, whose wave vectors are given by qi = [1/2 0 0]o and q2 = [0 1/2 0]o in the orthorhombic-Pnma notation. In addition, eigenvectors of these two transverse waves were also determined to be parallel to the same [001]o direction.

DOI： 10.4028/www.scientific.net/MSF.879.1393

Scopus

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Large-scale phase separation with nano-twin domains in manganite spinel (Co,Fe,Mn)<inf>3</inf>O<inf>4</inf> 査読有り

Horibe Y., Takeyama S., Mori S.

AIP Conference Proceedings 1763 2016年08月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2016 Author(s).The effect of Mn concentration on the formation of nano-domain structures in the spinel oxide (Co,Fe,Mn)3O4 was investigated by electron diffraction, bright-, and dark-field imaging technique with transmission electron microscopy. Large scale phase separation with nano-twin domains was observed in Co0.6Fe1.0Mn1.4O4, in contrast to the highly aligned checkerboard nano-domains in Co0.6Fe0.9Mn1.5O4. Diffusion of the Mn3+ ions with the Jahn-Teller distortions is suggested to play an important role in the formation of checkerboard nano-domain structure.

DOI： 10.1063/1.4961358

Scopus

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Features of the ferroelectric domain structure in the multiferroic material YbMnO<inf>3</inf> 査読有り

Inoshita T., Inoue Y., Horibe Y., Koyama Y.

MRS Advances 1 ( 9 ) 591 - 596 2016年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2016 Materials Research Society. The multiferroic material YbMnO3 has been reported to exhibit both ferroelectric and antiferromagnetic orders in the ground state. Of these two orders, the ferroelectric order is associated with the P63/mmc-to-P63cm structural transition, which occurs around 1270 K. The interesting feature of the ferroelectric state is that a cloverleaf domain structure with a pseudo-six-fold symmetry is observed in transmission electron microscopy images with the beam incidence parallel to the hexagonal axis. To understand the origin of the formation of the cloverleaf domain structure, we have examined the crystallographic features of the ferroelectric state in YbMnO3 by transmission electron microscopy. In this study, particularly, we adopted the experimental condition that electron beam incidences are perpendicular to the hexagonal axis. It was, as a result, found that there existed various ferroelectric domain structures including the cloverleaf domain structure under the present condition. The notable feature of domain structures found in this study is that each domain structure basically consists of six domains, whose domain boundaries are terminated at one point. Because this feature makes us reminiscent of a discommensurate structure in an incommensurate state, we took high-resolution electron micrographs of areas including domain boundaries. Their analysis indicated that a domain boundary could be identified as a discommensuration with a phase slip of π/3. It is thus understood that the cloverleaf domain structure should be one of domain morphologies for a discommensurate structure, which is related to the break of the translational symmetry.

DOI： 10.1557/adv.2016.154

Scopus

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Crystallographic features in the vicinity of the morphotropic phase boundary in the multiferroic material Bi<inf>1-x</inf>Sm<inf>x</inf>FeO<inf>3</inf> 査読有り

Nomoto M., Inoshita T., Inoue Y., Horibe Y., Koyama Y.

MRS Advances 1 ( 9 ) 573 - 578 2016年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2016 Materials Research Society. The multiferroic material Bi 1-x Sm xFeO 3 shows ferroelectric and antiferromagnetic properties in the ground state of the Bi-rich side. When the Sm content increases from x = 0 in BiFeO 3 , the (ferroelectric-R3c → paraelectric-Pnma) state change occurs around x = 0.14. According to the previous studies on Bi 1-x Sm xFeO 3 , the state boundary between the R3c and Pnma states can be identified as a morphotropic phase boundary (MPB), which is nearly parallel to the temperature axis in the state diagram. The notable feature of Bi 1-x Sm xFeO 3 is that a remarkable piezoelectric response was also found near the MPB. However, the origin of the remarkable response has not been understood sufficiently. In this study, thus, the crystallographic features in the vicinity of the MPB have been examined by x-ray powder diffraction and transmission electron microscopy. It was confirmed that the R3c and Pnma states were present for 0 ≤ x ≤ 0.15 and for 0.16 ≤ x ≤ 0.30, respectively. In addition to these states, there also existed the PbZrO 3 -type state around x = 0.15, which was identified as a modulated structure. Based on the analysis of the modulated structure, furthermore, it was suggested that the PbZrO 3 -type state could be regarded as a 2q state, which is characterized by two transverse modulation waves with k1 = [1/2 0 0]o and k2 = [0 1/2 0] o in the orthorhombic-Pnma notation.

DOI： 10.1557/adv.2016.155

Scopus

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特集「顕微鏡法による材料開発のための微細構造研究最前線(10)」—顕微鏡イメージング技術の進展と材料科学の新展開— 企画にあたって査読有り

佐藤和久, 赤瀬善太郎, 佐藤幸生, 千星聡, 高橋淳, 垂水竜一, 堀部陽一, 本間智之

まてりあ ( 公益社団法人日本金属学会 ) 55 ( 12 ) 575 - 575 2016年01月

Electronic phase transition in hollandite titanates BaxTi8O16+δ 査読有り

R. Murata, T. Sato, T. Okuda, Y. Horibe, H. Tsukasaki, S. Mori, N. Yamaguchi, K. Sugimoto, S. Kawaguchi, M. Takata, and T. Katsufuji

Physical Review B 92 220408 (R) 2015年12月

The hysteresis properties analysis of Fe-4 wt% Si prepared by high purity metallurgy 査読有り

Z. Lei, T. Horiuchi, I. Sasaki, C. Kaido, M. Takezawa, S. Hata, Y. Horibe, T. Ogawa, and H. Era

Journal of the Magnetics Society of Japan 40 8 - 12 2015年12月

Hysteresis and Domain Behaviors Analysis of High Purity Fe-(5, 6) wt% Si Alloys 査読有り

Z. Lei, T. Horiuchi, I. Sasaki, C. Kaido, Y. Horibe, S. Hata, T. Ogawa, and H. Era

Physics Procedia 75 695 - 702 2015年12月

Duality of Topological Defects in Hexagonal Manganites 査読有り

F.-T. Huang, X. Wang, S. M. Griffin, Y. Kumagai, O. Gindele, M.-W. Chu, Y. Horibe, N. A. Spaldin, and S.-W. Cheong

Physical Review Letters 113 267602 2014年12月

Observation of vortex domain structures in multiferroic hexagonal manganites RMnO3 by transmission electron microscopy 査読有り

Y. Horibe, F.-T. Huang, T. Choi, N. Lee, and S.-W. Cheong

Microscopy 63 - i22 2014年11月

マルチフェロイック材料RMnO3のドメイン構造とその特性

堀部陽一, Fei-Ting Huang, Sang-Wook Cheong

まてりあ ( 日本金属学会 ) 53 355 - 362 2014年08月

Color theorems, chiral domain topology and magnetic properties of FexTaS2 査読有り

Y. Horibe, J. J. Yang, Y. -H. Cho, X. Luo, S. B. Kim, Y. S. Oh, F. -T. Huang, T. Asada, M. Tanimura, D. J. Jeong, and S. -W. Cheong

Journal of American Chemical Society Accepted 2014年06月

Unfolding of Vortices into Topological Stripes in a Multiferroic Material 査読有り

X. Wang, M. Mostovoy, M. G. Han, Y. Horibe, T. Aoki, Y. Zhu, S.-W. Cheong

Physical Review Letters 112 247601 2014年06月

Ferroelectric and Structural Antiphase Domain and Domain Wall Structures in Y(Mn, Ti)O3 査読有り

S. Mori, K. Kurushima, H. Kamo, Y. Ishii, F. -T. Huang, Y. Horibe, T. Kastufuji, S. -W. Cheong

Ferroelectrics 462 162 - 166 2014年04月

Transferring MBE-Grown Topological Insulator Films to Arbitrary Substrates and Metal−Insulator Transition via Dirac Gap 査読有り

N. Bansal, M. R. Cho, M. Brahlek, N. Koirala, Y. Horibe, J. Chen, W. Wu, Y. D. Park, and S. Oh

Nano Letters 14 1343 - 1348 2014年02月

マルチフェロイック材料 RMnO3 のドメイン構造とその特性招待有り査読有り

堀部陽一, Huang Fei-Ting, Cheong Sang-Wook

まてりあ 53 ( 8 ) 355 - 362 2014年01月

7aPS-7 六方晶マンガン酸化物RMnO_3(R=希土類元素,In)における局所構造とドメイン構造(7aPS 領域10ポスターセッション(誘電体・格子欠陥・中性子),領域10(構造物性(誘電体,格子欠陥,X線・粒子線,フォノン)))

堀部陽一, Huang F.-T., 久留島康輔, 森茂生, Cheong S.-W.

日本物理学会講演概要集 69 ( 0 ) 2014年01月

27aAM-3 六方晶マンガン酸化物InMnO_3における構造相転移(27aAM (マルチフェロ,酸化物系),領域10(誘電体,格子欠陥,X線・粒子線,フォノン))

堀部陽一, Huang F.-T., 久留島康輔, 森茂生, Cheong S.-W.

日本物理学会講演概要集 69 ( 0 ) 2014年01月

マルチフェロイック六方晶マンガン酸化物のボルテックス分域構造と新奇物性

堀部陽一

日本結晶学会誌 56 ( 2 ) 92 - 97 2014年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Characteristic behavior and physical properties associated with the vortex domain structure in multiferroic hexagonal manganites RMnO3（R＝Y, and Ho）have been investigated mainly using transmission electron microscopy and high angle annular dark field scanning transmission electron microscopy. The insulating nature due to peculiar local structures is found at the vortex domain boundaries. In addition, unique 180° charged ferroelectric boundaries originated from the vortex domain formation are discovered, leading to selective boundary conduction related to bound charge screening.

DOI： 10.5940/jcrsj.56.92

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/130004552891

Delicate balance between ferroelectricity and antiferroelectricity in hexagonal InMnO3 査読有り

F. -T. Huang, X. Wang, Y. S. Oh, K. Kurushima, S. Mori, Y. Horibe, and S.-W. Cheong

Physical Review B 87 ( 184109 ) 2013年05月

Evolution of the domain topology in a ferroelectric 査読有り

S. C. Chae, Y. Horibe, D. Y. Jeong, N. Lee, K. Iida, M. Tanimura and S.-W. Cheong

Physical Review Letters 110 167601 2013年04月

Real-space imaging of ferroelectric and structural antiphase domains in hexagonal YMnO3 査読有り

K. Kobayashi, H. Kamo, K. Kurushima, Y. Horibe, S.-W. Cheong, Y. Togawa, S. Mori

Journal of the Korean Physical Society 62 1077 - 1081 2013年04月

Anionic Depolymerization Transition in IrTe2 査読有り

Yoon Seok Oh, J. J. Yang, Y. Horibe, and S.-W. Cheong

Physical Review Letters 110 127209 2013年03月

Preformed nanoscale ferromagnetism in manganites 査読有り

Horibe Y., Mori S., Asaka T., Asaka T., Matsui Y., Sharma P., Koo T., Guha S., Chen C., Cheong S.

Euro Physics Letters 100 ( 6 ) 2012年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

In order to clarify the electronic phase separation consisting of distinct ferromagnetic (FM) metallic and charge-ordered (CO) insulating phases in the colossal magnetoresistive (La, Pr, Ca)MnO3, we have carefully examined the electronic inhomogeneities by Lorentz microscopy, combined with conventional magnetic studies. We discovered the presence of an intermediate FM state characterized by the emergence of nanoscale (10-20 nm) magnetic regions (magnetic nano-droplets) in the intermediate temperature window above the FM transition temperature. The magnetic nano-droplets in fact precede the onset of ferromagnetic long-range order. It is also found that this intermediate state with magnetic nano-droplets is intimately coupled with the presence of the short-range CO regions. © Copyright EPLA, 2012.

DOI： 10.1209/0295-5075/100/67007

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Doping effect on interlocked ferroelectric and structural antiphase domains in YMnO <inf>3</inf> 査読有り

Kobayashi K., Koyama T., Kamo H., Togawa Y., Togawa Y., Horibe Y., Horibe Y., Cheong S., Cheong S., Mori S., Mori S.

Japanese Journal of Applied Physics 51 ( 9 PART 2 ) 2012年09月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Changes in ferroelectric and structural antiphase domain structure by the partial substitution of nonmagnetic Ti4+ ions at the Mn site were investigated carefully by electron diffraction, dark-field imaging, and high-resolution lattice imaging experiments. The ferroelectric and structural antiphase domains are revealed to be mutually interlocked in YMnO 3 and, on the other hand, when x was increased up to x 0:30 in YMn1x TixO 3, the ferroelectric domains disappeared and the size of the structural antiphase domains decreased to approximately 10nm at x 0:30. High-resolution lattice images clearly demonstrate the coexisting state of nanodomains characterized by the modulated structure due to the structural trimerization and the nonmodulated structures. Our experimental results suggest that a partial substitution of Ti4+ ions suppressed the ferroelectric displacement along the [001] direction and the correlation length of the Mn3+ trimerization decreased. © 2012 The Japan Society of Applied Physics.

DOI： 10.1143/JJAP.51.09LE09

Scopus

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Direct observation of the proliferation of ferroelectric loop domains and vortex-antivortex pairs 査読有り

Chae S., Lee N., Horibe Y., Tanimura M., Mori S., Mori S., Gao B., Carr S., Carr S., Cheong S.

Physical Review Letters 108 ( 16 ) 2012年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

We discovered stripe patterns of trimerization-ferroelectric domains in hexagonal REMnO 3 (RE=Ho,Lu) crystals (grown below ferroelectric transition temperatures (T c), reaching up to 1435°C), in contrast with the vortex patterns in YMnO 3. These stripe patterns roughen with the appearance of numerous loop domains through thermal annealing just below T c, but the stripe domain patterns turn to vortex-antivortex domain patterns through a freezing process when crystals cross T c even though the phase transition appears to not be Kosterlitz-Thouless-type. The experimental systematics are compared with the results of our six-state clock model simulation and also the Kibble-Zurek mechanism for trapped topological defects. © 2012 American Physical Society.

DOI： 10.1103/PhysRevLett.108.167603

Scopus

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Charge-orbital density wave and superconductivity in the strong spin-orbit coupled IrTe <inf>2</inf> Pd 査読有り

Yang J., Yang J., Choi Y., Oh Y., Hogan A., Horibe Y., Kim K., Min B., Cheong S., Cheong S., Cheong S.

Physical Review Letters 108 ( 11 ) 2012年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

Using transmission electron microscopy, the anomalies in resistivity and magnetic susceptibility at ∼262K in IrTe 2 are found to accompany the superlattice peaks with q=(1/5,0,-1/5). The wave vector is consistent with our theoretical calculation for the Fermi surface nesting vector, indicating that the ∼262K transition is of the charge-orbital density wave (DW) type. We also discovered that both Pd intercalation and substitution induce bulk superconductivity with T c up to ∼3K, which competes with DW in a quantum critical pointlike manner. © 2012 American Physical Society.

DOI： 10.1103/PhysRevLett.108.116402

Scopus

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Exchange bias in multiferroic RFe <inf>2</inf>O <inf>4</inf> (R = Y, Er, Tm, Yb, Lu, and In) 査読有り

Yoshii K., Ikeda N., Nishihata Y., Maeda D., Fukuyama R., Nagata T., Kano J., Kambe T., Horibe Y., Mori S.

Journal of the Physical Society of Japan 81 ( 3 ) 2012年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

An exchange bias (EB) behavior has been observed for multiferroic RFe 2O 4 (R = Y, Er, Tm, Yb, Lu, and In). The materials with small R 3+ ions (R = Tm, Yb, Lu, and In) exhibit large EB fields (≳1 kOe) below ∼ 100-150 K. This property is rooted in a magnetically glassy state, arising from the competition between ferromagnetic and antiferromagnetic domain interactions. In addition, the EB field tends to be more enhanced for smaller R 3+ ions. Hence, the EB is controlled by the substitution at the R-site in this series. © 2012 The Physical Society of Japan.

DOI： 10.1143/JPSJ.81.033704

Scopus

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Conduction of topologically protected charged ferroelectric domain walls 査読有り

Wu W., Horibe Y., Lee N., Cheong S., Guest J.

Physical Review Letters 108 ( 7 ) 2012年02月

記述言語：英語掲載種別：研究論文（学術雑誌）

We report on the observation of nanoscale conduction at ferroelectric domain walls in hexagonal HoMnO 3 protected by the topology of multiferroic vortices using in situ conductive atomic force microscopy, piezoresponse force microscopy, and Kelvin-probe force microscopy at low temperatures. In addition to previously observed Schottky-like rectification at low bias, conductance spectra reveal that negatively charged tail-to-tail walls exhibit enhanced conduction at high forward bias, while positively charged head-to-head walls exhibit suppressed conduction at high reverse bias. Our results pave the way for understanding the semiconducting properties of the domains and domain walls in small-gap ferroelectrics. © 2012 American Physical Society.

DOI： 10.1103/PhysRevLett.108.077203

Scopus

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Ferroelectric and structural antiphase domains in hexagonal RMnO 3 査読有り

Kobayashi K., Koyama T., Horibe Y., Katsufuji T., Cheong S., Mori S.

Materials Research Society Symposium Proceedings 1397 20 - 25 2011年12月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

We have investigated characteristic ferroelectric and structural antiphase domain structures in single crystals of hexagonal RMnO3 (R=Y, Ho, Lu, and Yb) by obtaining various electron diffraction patterns, dark-filed images and high-resolution lattice images. In the ferroelectric phase RMnO3 characteristic domain structures consisting of six ferroelectric and structural antiphase domains, which can be identified as the "cloverleaf" pattern, is found in the (110) plane, in addition to the (001) plane, and are inherent to the ferroelectric phase of hexagonal RMnO3. In domain configuration with the cloverleaf pattern in the (110) plane, the structural antiphase boundaries are inclined to be parallel to the [001] direction. © 2012 Materials Research Society.

DOI： 10.1557/opl.2012.448

Scopus

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Epitaxial growth of topological insulator Bi<inf>2</inf>Se<inf>3</inf> film on Si(111) with atomically sharp interface 査読有り

Bansal N., Kim Y., Edrey E., Brahlek M., Horibe Y., Iida K., Tanimura M., Li G., Feng T., Lee H., Gustafsson T., Andrei E., Oh S.

Thin Solid Films 520 ( 1 ) 224 - 229 2011年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

Atomically sharp epitaxial growth of Bi2Se3 films is achieved on Si(111) substrate with molecular beam epitaxy. Two-step growth process is found to be a key to achieve interfacial-layer-free epitaxial Bi 2Se3 films on Si substrates. With a single-step high temperature growth, second phase clusters are formed at an early stage. On the other hand, with low temperature growth, the film tends to be disordered even in the absence of a second phase. With a low temperature initial growth followed by a high temperature growth, second-phase-free atomically sharp interface is obtained between Bi2Se3 and Si substrate, as verified by reflection high energy electron diffraction (RHEED), transmission electron microscopy (TEM) and X-ray diffraction. The lattice constant of Bi 2Se3 is observed to relax to its bulk value during the first quintuple layer according to RHEED analysis, implying the absence of strain from the substrate. TEM shows a fully epitaxial structure of Bi 2Se3 film down to the first quintuple layer without any second phase or an amorphous layer. © 2011 Elsevier B.V.

DOI： 10.1016/j.tsf.2011.07.033

Scopus

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Thickness-dependent bulk properties and weak antilocalization effect in topological insulator Bi<inf>2</inf>Se<inf>3</inf> 査読有り

Kim Y., Kim Y., Brahlek M., Bansal N., Edrey E., Kapilevich G., Iida K., Tanimura M., Horibe Y., Cheong S., Oh S.

Physical Review B - Condensed Matter and Materials Physics 84 ( 7 ) 2011年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

We show that a number of transport properties in topological insulator (TI) Bi2Se3 exhibit striking thickness dependences over a range of up to five orders of thickness (3 nm-170 μm). Volume carrier density decreased with thickness, presumably due to diffusion-limited formation of selenium vacancies. Mobility increased linearly with thickness in the thin film regime and saturated in the thick limit. The weak antilocalization effect was dominated by a single two-dimensional channel over two decades of thickness. The sublinear thickness-dependence of the phase coherence length suggests the presence of strong coupling between the surface and bulk states. © 2011 American Physical Society.

DOI： 10.1103/PhysRevB.84.073109

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Multiple-charge modulations in the ferromagnetic insulating state of lightly doped La<inf>1-x</inf>Sr<inf>x</inf>MnO<inf>3</inf> 査読有り

Asaka T., Asaka T., Asaka T., Mori S., Horibe Y., Takenaka K., Yu X., Nagai T., Kimoto K., Kimoto K., Hirayama T., Matsui Y.

Physical Review B - Condensed Matter and Materials Physics 83 ( 17 ) 2011年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

We investigated the texture of charge modulations and behaviors of their domains in the ferromagnetic insulating state of La1-xSr xMnO3 (x=0.125) by low-temperature transmission electron microscopy. We observed simultaneous evolutions of three charge-modulated phases below ∼135 K, close to the charge-ordering-transition temperature T CO∼140 K. The phases form intricate domain structures within one ferromagnetic phase. This indicates that one magnetic state exhibits multiple-charge states. With further decreasing temperature, below ∼40 K, the three charge-modulated phases behave differently from one another. We consider that the behaviors would lead to a phase separation into the ferromagnetic insulating phase and the ferromagnetic metallic one. © 2011 American Physical Society.

DOI： 10.1103/PhysRevB.83.174401

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Magnetic chessboard-type nanodomains in Mn-doped CoFe2O 4 査読有り

Ohno M., Mori S., Togawa Y., Horibe Y.

IOP Conference Series: Materials Science and Engineering 18 ( SYMPOSIUM 6 ) 2011年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

We examined formation processes of ordered array of two types of rectangular nanorods, characterized as chessboard-type (CB-type) nanodomain structures, by changing the isothermal annealing time at 648 K. Highly organized CB-type nanodomain structures developed through the isothermal annealing treatment from 10 to 730 hours and consequently the CB-type nanodomain structures with ∼50 nm2 in size are formed in samples annealed for 730 hours. From the chemical composition analysis, it is revealed that the two types of rectangular nanorods comprise the coexisting state of one nanorod with composition close to CoFe1.4MnO4 with the cubic structure and another nanorod with composition close to CoFe0.4Mn2O4 with the orthorhombic structure. © Published under licence by IOP Publishing Ltd.

DOI： 10.1088/1757-899X/18/9/092052

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Self-organization, condensation, and annihilation of topological vortices and antivortices in a multiferroic 査読有り

Chae S., Horibe Y., Jeong D., Rodan S., Lee N., Cheong S.

Proceedings of the National Academy of Sciences of the United States of America 107 ( 50 ) 21366 - 21370 2010年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

The interaction among topological defects can induce novel phenomena such as disclination pairs in liquid crystals and superconducting vortex lattices. Nanoscale topological vortices with swirling ferroelectric, magnetic, and structural antiphase relationships were found in multiferroic h-YMnO 3. Herein, we report the discovery of intriguing, but seemingly irregular configurations of a zoo of topological vortices and antivortices. These configurations can be neatly analyzed in terms of graph theory and reflect the nature of self-organized criticality in complexity phenomena. External stimuli such as chemistry-driven or electric poling can induce the condensation and eventual annihilation of topological vortex- antivortex pairs.

DOI： 10.1073/pnas.1011380107

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Direct observation of low-temperature superstructure in spin- and charge-frustrated ferrite YFe<inf>2</inf> O<inf>4-δ</inf> 査読有り

Horibe Y., Ikeda N., Yoshii K., Mori S.

Physical Review B - Condensed Matter and Materials Physics 82 ( 18 ) 2010年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

The low-temperature superstructure of YFe2 O4-δ was carefully investigated by transmission electron microscopy. We found that the unique superstructure at about 100 K is characterized by 1̄ /142/71/14 -type superlattice reflection spots, suggesting the presence of charge-reordering process. The low-temperature high-resolution images clearly show superlattice modulations in Y-O layers as well as Fe-O layers. The modification of intrabilayer charge interactions due to lattice distortions in Y-O layers is discussed to play a crucial role in the stabilization of long-periodic superstructures at low temperatures. © 2010 The American Physical Society.

DOI： 10.1103/PhysRevB.82.184119

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Polarization-modulated rectification at ferroelectric surfaces 査読有り

Wu W., Guest J., Horibe Y., Park S., Choi T., Cheong S., Bode M.

Physical Review Letters 104 ( 21 ) 2010年05月

記述言語：英語掲載種別：研究論文（学術雑誌）

By correlating room temperature conductive atomic force microscopy with low temperature electrostatic force microscopy images of the same sample region, we demonstrate that nanoscale electric conduction between a sharp tip and the surface of ferroelectric HoMnO3 is intrinsically modulated by the polarization of ferroelectric domains. Conductance spectra reveal that the electric conduction is described by polarization-induced Schottky-like rectification at low bias, but dominated by a space-charge limited conduction mechanism at high bias. Our observation demonstrates visualization of ferroelectric domain structure by electric conduction, which may be used for nondestructive readout of nanoscale ferroelectric memories and/or ferroelectric sensors. © 2010 The American Physical Society.

DOI： 10.1103/PhysRevLett.104.217601

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Insulating interlocked ferroelectric and structural antiphase domain walls in multiferroic YMnO 3 査読有り

Choi T., Horibe Y., Yi H., Yi H., Choi Y., Wu W., Cheong S., Cheong S.

Nature Materials 9 ( 3 ) 253 - 258 2010年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

Hexagonal YMnO 3 shows a unique improper ferroelectricity induced by structural trimerization. Extensive research on this system is primarily due to its candidacy for ferroelectric memory as well as the intriguing coexistence of ferroelectricity and magnetism. Despite this research, the true ferroelectric domain structure and its relationship with structural domains have never been revealed. Using transmission electron microscopy and conductive atomic force microscopy, we observed an intriguing conductive cloverleaf pattern of six domains emerging from one pointall distinctly characterized by polarization orientation and structural antiphase relationships. In addition, we discovered that the ferroelectric domain walls and structural antiphase boundaries are mutually locked and this strong locking results in incomplete poling even when large electric fields are applied. Furthermore, the locked walls are found to be insulating, which seems consistent with the surprising result that the ferroelectric state is more conducting than the paraelectric state. These fascinating results reveal the rich physics of the hexagonal system with a truly semiconducting bandgap where structural trimerization, ferroelectricity, magnetism and charge conduction are intricately coupled.

DOI： 10.1038/nmat2632

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Oxygen-deficient effect on charge ordering in spin- and charge-frustrated ferrite YFe2O4-δ 査読有り

Y. Horibe, K. Yoshii, N. Ikeda, and S. Mori

Physical Review B 80 092104 2009年09月

Nanometer-Sized Domain Structures in LuFeMO4 (M = Cu, Co) Revealed by Energy-Filtered Transmission Electron Microscopy 査読有り

Y. Matuso, A. Hirata, Y. Horibe, K. Yoshii, N. Ikeda, and S. Mori

Ferroelectrics 380 56 - 62 2009年09月

Pancakelike Ising domains and charge-ordered superlattice domains in LuFe2O4 査読有り

S. Park, Y. Horibe, Y. J. Choi, C. L. Zhang, S.-W. Cheong, and W. WuMori

Physical Review B 79 180401(R) 2009年05月

Giant magnetic coercivity and ionic superlattice nano-domains in Fe0.25TaS2 査読有り

Y. J. Choi, S. B. Kim, T. Asada, S. Park, W. Wu, Y. Horibe, and S.-W. Cheong,

EUROPHYSICS LETTERS 86 37012 2009年05月

Magnetic and dielectric properties of YbFe2-xMnxO4 (0<x<1) 査読有り

K. Yoshii, N. Ikeda, T. Michiuchi, Y. Yokota, Y. Okajima, Y. Yoneda, Y. Matsuo, Y. Horibe, and S. Mori

Journal of Solid State Chemistry 182 1611 2009年04月

Two Types of Charge Ordering in the Half-Doped Manganites of Bi0.5(Ca,Sr)0.5MnO3 査読有り

Y. Horibe, J.-S. Ahn, P. A. Sharma, S. Mori, C. H. Chen, S.-J. Oh, and S.-W. Cheong

Journal of the Physical Society of Japan 78 044704 2009年03月

Epitaxial checkerboard arrangement of nanorods in ZnMnGaO4 films studied by x-ray diffraction 査読有り

S. M. O'Malley, P. L. Bonanno, K. H. Ahn, A. A. Sirenko, A. Kazimirov, Y. Horibe, T. Asada, M. Tanimura, S. Park, and S. -W. Cheong

Physical Review B 78 165424 2008年10月

Formation of pancakelike Ising domains and giant magnetic coercivity in ferrimagnetic LuFe2O4 査読有り

W. Wu, V. Kiryukhin, H.-J. Noh, K.-T. Ko, J.-H. Park, W. Ratcliff II, P. A. Sharma, N. Harrison, Y. J. Choi, Y. Horibe, S. Lee, S. Park, H. T. Li, C. L. Zhang, and S. -W. Cheong

Physical Review Letters 101 137203 2008年09月

Effect of Oxygen Vacancies on Charge Ordered Structure in YFe2O4-delta 査読有り

S. Mori, S. Shinohara, Y. Matsuo, Y. Horibe, K. Yoshii, and N. Ikeda

Japanese Journal of Applied Physics 47 7595 - 7598 2008年09月

Magnetic and dielectric properties of InFe2O4, InFeCuO4, and InGaCuO4 査読有り

K. Yoshii, N. Ikeda, Y. Okajima, Y. Yoneda, Y. Matsuo, Y. Horibe, and S. Mori

Inorganic Chemistry 47 6493 - 6501 2008年06月

Dilution effect on microstructures with respect to magnetic and dielectric properties in charge-ordered ferroelectric LuFe2O4 査読有り

Y. Matsuo, Y. Horibe, K. Yoshii, N. Ikeda, and S. Mori

Transactions of the Materials Research Society of Japan 33 31 - 34 2008年03月

Dilution effect on microstructures with respect to magnetic and dielectric properties in charge-ordered ferroelectric LuFe2O4 査読有り

Y. Matsuo, Y. Horibe, K. Yoshii, N. Ikeda, and S. Mori

Transactions of the Materials Research Society of Japan 33 31 - 34 2008年03月

Microstructures related to the ferroelectric properties in BiFeO3-BaTiO3 査読有り

S. Kitagawa, Y. Horibe, K. Yoshii, M. Suzuki, Y. Noguchi, S. Nishihara, Y. Hosokoshi, and S. Mori

Transactions of the Materials Research Society of Japan 33 27 - 30 2008年03月

Highly Aligned Epitaxial Nanolods with a Checkerboard Pattern in Oxide Films 査読有り

S. Park, Y. Horibe, T. Asada, L. S. Wielunski, N. Lee, P. L. Bonanno, S. M. O'Malley, A. A. Sirenko, A. Kazimirov, M. Tanimura, T. Gustafsson, and S. -W. Cheong

Nano Letters 8 720 - 724 2008年02月

Ferroelectric Domain Structures in BiFeO3-BaTiO3 査読有り

S. Kitagawa, T. Ozaki, Y. Horibe, K. Yoshii, and S. Mori

Ferroelectrics 376 122 - 128 2008年01月

Magnetic and dielectric properties of RFe2O4, RFeMO4, and RGaCuO4 (R=Yb and Lu, M=Co and Cu) 査読有り

K. Yoshii, N. Ikeda, Y. Matsuo, Y. Horibe, and S. Mori

Physical Review B 76 024423 2007年07月

Universality in one-dimensional orbital wave ordering in spinel and related compounds: an experimental perspective 査読有り

M. Croft, V. Kiryukhin, Y. Horibe, S-W. Cheong

New Journal of Physics 9 86 2007年04月

Coercivity and nanostructure in magnetic spinel Mg(Mn,Fe)2O4 査読有り

C. L. Zhang, S. Yeo, Y. Horibe, Y. J. Choi, S. Guha, M. Croft, S-W. Cheong, S. Mori

Applied Physics Letters 90 133123 2007年03月

Doping effect on ferroelectric microstructure in YMn1-xTixO3 査読有り

S. Mori, J. Tokunaga, Y. Horibe, T. Asada, Y. Koyama, T. Katsufuji

Ferroelectrics 348 170 - 176 2007年03月

Conduction Characteristics of Charge Ordering Type Ferroelectrics, YFe2O4 査読有り

K. Imamura, Y. Horibe, T. Yoshimura, N. Fujimura, S. Mori, and N. Ikeda

Materials Research Society Symposium Proceedings 966 T07-27 2007年03月

Doping effect on the charge ordering in LuFe2O4 査読有り

Y. Matsuo, S. Shinohara, S. Mori, Y. Horibe, K. Yoshii, and N. Ikeda

Materials Research Society Symposium Proceedings 966 T03-04 2007年03月

Solid state self-assembly of nanocheckerboards 査読有り

S. Yeo, Y. Horibe, S. Mori, C. M. Tseng, C. H. Chen, A. G. Khachaturyan, C. L. Zhang, S-W. Cheong

Applied Physics Letters 89 233120 2006年12月

Incommensurate Structural Correlations in the Disordered Spin-Dimer State Induced by X-Ray and Electron Irradiation in CuIr2S4 査読有り

V. Kiryukhin, Y. Horibe, Y. S. Hor, H. J. Noh, S-W. Cheong, C. H. Chen

Physical Review Letters 97 225503 2006年12月

Nanoscale ferromagnetism in phase-separated manganites 査読有り

S. Mori, Y. Horibe, T. Asaka, Y. Matsui, C. H. Chen, S-W. Cheong

Journal of Magnetism and Magnetic Materials 310 870 - 872 2006年11月

Doping effect on the charge ordering in LuFe2O4 査読有り

Y. Matsuo, Y. Horibe, S. Mori, K. Yoshii, and N. Ikeda

Journal of Magnetism and Magnetic Materials 310 349 - 351 2006年11月

Observation of magnetic domain structures in La1-xSrxMnO3 査読有り

T. Asaka, S. Mori, Y. Horibe, K. Takenaka, K. Ishizuka, K. Kimoto, Y. Matsui

Journal of Magnetism and Magnetic Materials 310 782 - 784 2006年10月

Spontaneous formation of vanadium “molecules” in a geometrically frustrated crystal: AlV2O4 査読有り

Y. Horibe, M. Shingu, K. Kurushima, H. Ishibashi, N. Ikeda, K. Kato, Y. Motome, N. Furukawa, S. Mori, and T. Katsufuji

Physical Review Letters 96 086406 2006年03月

Magnetocapacitance effect and related microstructure in Ti-doped YMnO3 査読有り

S. Mori, J. Tokunaga, Y. Horibe, Y. Aikawa, and T. Katsufuji

Physical Review B 72 224434 2005年12月

Structural Phase Transition and Domain Structures in YMn1-xTixO3 査読有り

S. Mori, J. Tokunaga, Y. Horibe, Y. Aikawa and T. Katsufuji

Japanese Journal of Applied Physics 44 7174 - 7176 2005年09月

Microstructures Associated with Dielectric and Magnetic Properties in (1-x)BiFeO3-xBaTiO3 査読有り

Y. Horibe, M. Nakayama, Y. Hosokoshi, T. Asaka, Y. Matsui, T. Asada, Y. Koyama, and S. Mori

Japanese Journal of Applied Physics 44 7148 - 7150 2005年09月

Nano-sized domains related to dielectric anomaly in YFe2O4-delta 査読有り

Y. Horibe, K. Kishimoto, S. Mori, and N. Ikeda

Journal of Electron Microscopy 54 i87 - i90 2005年09月

Ferromagnetic microstructure in double exchange manganites 査読有り

S. Mori, T. Asaka, Y. Horibe, Y. Matsui, and T. Takenaka

Journal of Electron Microscopy 54 i65 - i68 2005年09月

Frustration and ordering of iron ions on triangular iron mixed valence system RFe2O4 査読有り

N. Ikeda, H. Ohsumi, M. Mizumaki, S. Mori, Y. Horibe and K. Kishimoto

Journal of Magnetism and Magnetic Materials 272-276 E1037 - E1039 2005年09月

Ferroelectricity from iron valence ordering in the charge-frustrated system LuFe2O4 査読有り

N. Ikeda, H. Ohsumi, K. Ohwada, K. Ishii, T. Inami, K. Kakurai, Y. Murakami, K. Yoshii, S. Mori, Y. Horibe, and H. Kito

Nature 436 1136 - 1138 2005年08月

Dynamical reordering of charge stripes in (Bi, Ca) MnO3 driven by electron beam irradiation 査読有り

Y. Horibe, C. H. Chen, S-W. Cheong, and S. Mori

EUROPHYSICS LETTERS 70 383 - 389 2005年04月

Charge ordered microdomains in Cr doped AlV2O4 査読有り

K. Kurushima, Y. Horibe, S. Mori, T. Asada, Y. Koyama, M. Shingu, T. Katsufuji

Transactions of the Materials Research Society of Japan 30 101 - 104 2005年03月

Doping effect on the charge ordering in AlV2O4 査読有り

Y. Horibe, K. Kurushima, S. Mori, T. Asada, Y. Koyama, M. Shingu, and T. Katsufuji

Physical Review B 71 052411 2005年02月

Ferroelectric domains in hexagonal YMnO3 査読有り

S. Mori, Y. Horibe, and T. Katsufuji

Journal of the Korean Physical Society 46 37 - 39 2005年01月

Structural phase transitions and dielectric anomaly in YFe2O4-δ 査読有り

Y. Horibe, K. Kishimoto, S. Mori, and N. Ikeda

Journal of the Korean Physical Society 46 192 - 194 2005年01月

Dielectric anomaly and structural phase transitions in YFe2O4-δ 査読有り

Y. Horibe, K. Kishimoto, S. Mori, and N. Ikeda

INTEGRATED FERROELECTRICS 67 151 - 157 2004年04月

Ferromagnetic domain structure in La1-xSrxMnO3 (x=0.125) 査読有り

S. Mori, T. Asaka, Y. Horibe, Y. Matsui, R. Shiozaki, K. Takenaka, and S. Sugai

MATERIALS TRANSACTIONS 44 2567 - 2569 2003年12月

Inhomogeneous CuO6 tilt distribution and charge-spin correlations in La2-x-yNdySrxCuO4 around the commensurate hole concentration 査読有り

A. Gozar, B. S. Dennis, T. Siegrist, Y. Horibe, G. Blumberg, S. Komiya, and Y. Ando

Physical Review B 68 052511 2003年08月

Ordered hydrophobic organosilicates templated by block copolymers 査読有り

S. Yang, Y. Horibe, C. H. Chen, P. Mirau, and T Tatry, P. Evans, J. Grazul, and Eric M. Dufresne

Chemistry of Materials 14 5173 - 5178 2002年11月

X-ray-induced disordering of the dimerization pattern and apparent low-temperature enhancement of lattice symmetry in spinel CuIr2S4 査読有り

H. Ishibashi, T. Y. Koo, Y. S. Hor, A. Borissov, Y. Horibe, P. G. Radaelli, S-W. Cheong, and V. Kiryukhim

Physical Review B 66 144424 2002年10月

Percolative superconductivity in Mg1-xB2 査読有り

P. A. Sharma, N. Hur, Y. Horibe, C. H. Chen, B. G. Kim, S. Guha, M. Z. Cieplak, and S-W. Cheong

Physical Review Letters 89 167003 2002年10月

Electronic phase separation in complex materials 査読有り

S-W. Cheong, P. A. Sharma, N. Hur, Y. Horibe, and C. H. Chen

Physica B 318 39 - 51 2002年05月

Formation of Isomorphic Ir+3- and Ir+4- Octamers and Spin Dimerisation in the Spinel CuIr2S4 査読有り

P. G. Radaelli, Y. Horibe, M. J. Gutmann, H. Ishibashi, C. H. Chen, R. M. Ibberson, Y. Koyama, Y. S. Hor, V. Kiryukhin, and S-W. Cheong

Nature 416 155 - 158 2002年03月

Ordered hydrophobic organosilicates templated by block copolymers 査読有り

S. Yang, Y. Horibe, C. H. Chen, P. Mirau, and T Tatry

Abstracts of papers of the American Chemical Society 224 350 2002年03月

High-quality MgB2 films on boron crystals with onset Tc of 41.7 K 査読有り

N. Hur, P. A. Sharma, S. Guha, M. Z. Cieplak, D. J. Werder, Y. Horibe, C. H. Chen, and S-W. Cheong

Applied Physics Letters 79 4180 - 4182 2001年12月

Direct observation of dynamic local structure in La2-xSrxCuO4 around x=0.12 査読有り

Y. Horibe, Y. Inoue, and Y. Koyama

Physical Review B 61 11922 - 11927 2000年05月

Low-temperature structural phase transitions and Tc suppression in Zn substituted in La2-xSrxCuO4 査読有り

Y. Inoue, Y. Horibe, and Y. Koyama

Stripes and Related Phenomena 501 2000年05月

Features of the modulated structure in the layered perovskite manganate Sr1.8La0.2MnO4 査読有り

Y. Horibe, N. Komine, Y. Koyama, and Y. Inoue, "", , edited by Antonio Bianconi and Naurang L. Saini

Stripes and Related Phenomena 455 2000年05月

FEATURES OF MICROSTRUCTUE IN Ca2MnO4-delta 査読有り

Y. Inoue, Y. Horibe, and Y. Koyama

Advances in Superconductivity XII 586 2000年02月

LOCAL STRUCTURAL FLUCTUATION IN THE SUPERCONDUCTING STATE OF La2-xSrxCuO4 査読有り

Y. Horibe, Y. Koyama, and Y. Inoue

Transactions of the Materials Research Society of Japan 24 133 1999年01月

La系酸化物における低温構造相転移と超伝導査読有り

堀部陽一、井上靖秀、小山泰正

日本金属学会誌 61 ( 9 ) 1006 - 1011 1998年09月

Features of Crystal Structure in Ca2RuO4 査読有り

Y. Inoue, Y. Horibe, Y. Koyama, S. Nakatsuji, S. Ikeda, and Y. Maeno

Advances in Superconductivity X 586 1998年02月

Modulated Structures in La2-xSrxMO4 (M=Ni, Mn) 査読有り

Y. Horibe, N. Matsuoka, N. Komine, Y. Koyama, and Y. Inoue

Advances in Superconductivity X 227 1998年02月

New aspect of low-temperature phase transitions of La-cuprates 査読有り

Y. Horibe, Y. Inoue, and Y. Koyama

Journal of Superconductivity 10 461 - 466 1997年12月

Characteristic Features of Low-Temperature Structural Phase Transitions in La2-xSrxCuO4 査読有り

Y. Inoue, Y. Horibe, and Y. Koyama

Journal of Superconductivity 10 361 - 366 1997年12月

Evolution of low-temperature phases in a low-temperature structural phase transition of a La cuprate 査読有り

Y. Inoue, Y. Horibe, and Y. Koyama

Physical Review B 56 14176 - 14179 1997年04月

MICROSTRUCTURE AND Tc- SUPPRESSION IN La-CUPRATES 査読有り

Y. Horibe, Y. Inoue, and Y. Koyama

Physica C 282-287 1071 - 1072 1997年02月

MICROSTRUCTURE IN LOW- TEMPERATURE STRUCTURAL PHASE TRANSITIONS OF La1.60-xSrxNd0.40CuO4 査読有り国際誌

Y. Inoue, Y. Horibe, and Y. Koyama

Advances in Superconductivity IX 265 1997年02月

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