2022/06/07 更新

ホリデ トモヤ
堀出 朋哉
Horide Tomoya
Scopus 論文情報  
総論文数: 0  総Citation: 0  h-index: 13

Citation Countは当該年に発表した論文の被引用数

所属
大学院工学研究院 物質工学研究系
職名
准教授
研究室住所
福岡県北九州市戸畑区仙水町1-1
外部リンク

取得学位

  • 京都大学  -  博士(工学)   2008年03月

学内職務経歴

  • 2017年04月 - 現在   九州工業大学   大学院工学研究院   物質工学研究系     准教授

論文

  • Aligned Self-Organization Induced by Epitaxial Stress and Shear Deformation in Jahn–Teller Spinel ZnMnGaO<inf>4</inf> 査読有り 国際誌

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

    Journal of Physical Chemistry C   126 ( 1 )   806 - 814   2022年01月

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    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)

    Spinel ZnMnGaO4 exhibits the characteristic self-organization dominated by phase separation and strain to realize an ordered nanostructure. To control the self-organization, ZnMnGaO4 films fabricated using pulsed laser deposition were postannealed. While the ordered nano-checkerboard and the slightly coarse nanolamellar structures were observed for the moderate annealing temperature and the long annealing time, the twin structure was formed in the films annealed at the low temperature for the short annealing time. The cross-sectional observation showed the vertically aligned nanostructure near the surface (twin, nano-checkerboard, or nanolamellar) and the nondefective epitaxial layer near the substrate. The ZnMnGaO4 films exhibited the same in-plane lattice parameter as that of MgO along the MgO[110]//ZMGO[101] regardless of annealing conditions, and the stress analysis indicates that the epitaxial stress at the epitaxial ZnMnGaO4/MgO and the shear stress at the epitaxial ZnMnGaO4/twinned ZnMnGaO4 determined the vertical structure and the twin width. The thermodynamic stability and the Mn and Ga diffusion basically bring about the self-organized nanostructure formation as in bulk, and the epitaxial stress and the interface shear stress align the self-organization in the films. Thus, the highly aligned self-organized nanostructures can be fabricated in the annealed ZnMnGaO4 films by tuning these factors.

    DOI: 10.1021/acs.jpcc.1c09324

    Scopus

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  • Self-organized formation of a-few-nanometer sized nanocolumns in chalcogenide-oxide nanocomposite film 査読有り

    Horide T., Ichinose A., Tokura F., Matsumoto K.

    Thin Solid Films   733   2021年09月

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    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)

    Nanocomposite films are thin films with the addition of nano-sized second phases, and they are very promising for improving properties of chalcogenide films, such as superconducting vortex pinning. However, there are very few reports on the chalcogenide nanocomposite films, although many researchers are studying the oxide nanocomposite films. Since the process conditions for chalcogenide films are different from those for oxide films, the chalcogenide nanocomposite films are expected to have a characteristic structure. Here, we show fabrication of chalcogenide nanocomposite films containing self-organized oxide nanocolumns. FeSe+SrTiO3(STO) nanocomposite films were prepared using pulsed laser deposition, where the FeSe target with the STO sector was laser-ablated. The FeSe matrix kept the epitaxial relationship with LaAlO3 substrates even in the nanocomposite films, but the crystallinity and orientation of FeSe were degraded. Transmission electron microscopy observation clarified that Sr-Ti-O nanocolumns with the diameter of 2-5 nm and the spacing of <10 nm were formed at the deposition temperature of 450-550 ºC and the STO content of <25areal%. The formation of the FeSe+STO nanocomposite was affected by the low deposition temperature and interface instability. As a result, the nanocolumn diameter in the present chalcogenide-oxide nanocomposite was smaller than that in the oxide-oxide nanocomposites. This nanocolumn morphology (shape, diameter, and spacing) is expected to effectively influence the properties of chalcogenides.

    DOI: 10.1016/j.tsf.2021.138802

    Scopus

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  • Thermoelectric Property of n-Type Bismuth-Doped SnSe Film: Influence of Characteristic Film Defect 査読有り

    Horide T., Nakamura K., Hirayama Y., Morishita K., Ishimaru M., Matsumoto K.

    ACS Applied Energy Materials   2021年08月

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    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)

    Highly aligned SnSe exhibits very high thermoelectric properties, and orientation control in films is very promising for developing high-performance thermoelectric modules. While SnSe films with intrinsic p-type nature have been reported, fabrication of the highly aligned n-type SnSe films is difficult due to thermodynamic restriction on the solubility of the doping elements. Here, highly oriented SnSe films doped with Bi were successfully fabricated using pulsed laser deposition. Characteristic film structures were observed: doped Bi in the SnSe matrix; domain boundaries with a spacing of ∼200 nm; self-organized Bi precipitates with a bimodal size distribution; and stacking faults. The most important result is observation of the n-type Hall resistivity and the n-type Seebeck coefficient. The stacking faults and the doped Bi in the films degraded the room-temperature Seebeck coefficient. While the electron carrier mobility in room temperature was smaller than that in the single crystal due to the domain boundary scattering, the domain boundary scattering was suppressed in the high temperature of 300 °C. Thus, the characteristic film structures significantly affect the thermoelectric properties of SnSe. The doped Bi in the SnSe matrix, the stacking faults, and the domain boundaries should be controlled for further improvement of the thermoelectric properties in the Bi-SnSe films, and the self-organized Bi nanoprecipitates are very promising for achieving high-performance Bi-SnSe with decreased thermal conductivity.

    DOI: 10.1021/acsaem.1c01722

    Scopus

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  • Angular vortex phase diagram in YBa2Cu3O7 films with c-axis correlated pinning centers 査読有り

    Horide T., Ichino Y., Matsumoto K.

    Superconductor Science and Technology   34 ( 8 )   2021年08月

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    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)

    High temperature superconductors (HTSCs) exhibit rich vortex phases under the influence of nanoscale pinning centers, and complicated configurations and behavior of vortices are realized by anisotropic vortex pinning, vortex interaction, and line tension. To understand the behavior and configurations of vortices, YBa2Cu3O7 films containing self-organized nanorods (BaSnO3, BaZrO3, BaHfO3) were prepared, and the critical current density and the resistivity were measured for varying angles between the nanorods (//c-axis) and the magnetic field (θ) in the temperatures of 65-90 K. The trapping angle of the strong nanorod (θts) determines the vortex phase boundary in the magnetic field lower than the matching field (B < Bφ). While the large c-axis Jc peak and the resistivity dip are observed for θ < θts due to the vortex accommodation on the nanorods, the vortices for θ > θts are pinned by the matrix uncorrelated defects and/or the ab-plane pinning centers. In the magnetic field higher than Bφ(B > Bφ), the weak matrix c-axis correlated defects such as twin boundaries accommodate vortices at the angles smaller than the trapping angle of the matrix c-axis correlated defect. Although the matrix c-axis correlated defects do not pin the matrix-vortices for the larger angles, the matrix-vortices are pinned by the vacant nanorod portions that appear due to the magnetic field tilt. This vortex retrapping results in the off-axis Jc peak and the off-axis resistivity dip. Thus, the weak pinning by matrix defects, the cage potential, and the vortex retrapping as well as the strong nanorod pinning determine the angular vortex phase of the HTSCs containing c-axis correlated pinning centers.

    DOI: 10.1088/1361-6668/ac0953

    Scopus

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  • Nanostructures and flux pinning properties in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7- y </inf>thin films with double perovskite Ba<inf>2</inf>LuNbO<inf>6</inf>nanorods 査読有り

    Gondo M., Yoshida M., Yoshida Y., Ishimaru M., Horide T., Matsumoto K., Kita R.

    Journal of Applied Physics   129 ( 19 )   2021年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    Double perovskite Ba2LuNbO6 (BLNO)-doped YBa2Cu3O7-y (YBCO) thin films are fabricated on a SrTiO3 (001) substrate by pulsed laser deposition, and their nanostructures are characterized by transmission electron microscopy and scanning transmission electron microscopy. Cross-sectional observations and elemental mapping reveal that BLNO self-assembles during thin film deposition, and consequently, nanorods extending straight from the substrate to the surface are formed in the YBCO thin films. It is confirmed that stacking faults perpendicular to the growth direction disturb the formation of BLNO nanorods. Strain maps extracted by geometric phase analysis reveal that the tensile strain occurs in the YBCO matrix around the BLNO nanorods. Misfit dislocations are periodically introduced at the interface between the nanorod and the matrix, which results in the inhomogeneous strain of YBCO around the BLNO nanorods. The superconducting properties of the YBCO + BLNO thin films are compared with those of other previously reported YBCO thin films with normal perovskite and double perovskite nanorods.

    DOI: 10.1063/5.0048693

    Scopus

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  • Overcoming optimization constraint for J<inf>c</inf> by hybrid pinning in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7</inf> films containing nanorods 査読有り

    Horide T., Torigoe K., Kita R., Awaji S., Matsumoto K.

    Japanese Journal of Applied Physics   60 ( 2 )   2021年02月

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    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)

    Critical current density (Jc) in YBa2Cu3O7 films are improved by nanorods. Jc increases with increasing the nanorod content up to an optimum content, and decreases after exhibiting a maximum due to degradation of the nanorod structure. To overcome this optimization constraint, hybrid pinning consisting of multiple types of pinning centers was investigated. In the present study, Y2O3 nanoparticles were additionally introduced into the YBa2Cu3O7 films containing high density BaHfO3 nanorods to increase the effective matching field. As a result, the global pinning force maximum was shifted to high magnetic field, and the Jc was improved especially in high magnetic field. Thus, even in the case that the Jc improvement in the YBa2Cu3O7 + BaHfO3 was difficult by increasing the nanorod content, the Y2O3 addition successfully improved the Jc. This demonstrates that the hybrid pinning can overcome the optimization constraint for Jc in the YBa2Cu3O7 films containing nanorods.

    DOI: 10.35848/1347-4065/abdc32

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  • Combined effect of nanorod and stacking fault for improving nanorod interface in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ</inf>nanocomposite films 査読有り

    Horide T., Ishimaru M., Sato K., Matsumoto K.

    Superconductor Science and Technology   33 ( 11 )   2020年11月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Self-organized nanorods in YBa2Cu3O7-δ films are important pinning centers from the technical and fundamental views. While influence of nanoscale factors (>4-5 nm) on the vortex pinning has already been discussed in detail, the interface control of nanorods (at the smaller scale) has not yet been performed. Here, it is demonstrated that the stacking faults can control the nanorod interface to improve the vortex pinning. The stacking faults were formed across the nanorods by post-annealing the YBa2Cu3O7-δ films containing BaMO3 (M = Zr, Sn, Hf) nanorods. The strong bonding between YBa2Cu3O7-δ and BaMO3 varies the atomic position of YBa2Cu3O7-δ, degrading an interface sharpness and an elementary pinning force of the nanorod. Scanning transmission electron microscopy and density functional theory calculation clarified that the stacking faults broke the strong bonding between YBa2Cu3O7-δ and BaMO3 at the nanorod interface, and reduced the local strain around the nanorods, improving the elementary pinning force. As a result, the critical current density was improved in low temperature and low magnetic field when magnetic field was aligned with the c-axis. Thus, the combined effect of nanoinclusions and crystalline defects, in the present case, nanorods and stacking faults, can control the interface of nanoinclusion pinning centers, opening the interface design to realize the ideal pinning situation.

    DOI: 10.1088/1361-6668/abaebf

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  • Simultaneous achievement of high J <inf>c</inf>and suppressed J <inf>c</inf>anisotropy by hybrid pinning in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7</inf>three-phase-nanocomposite film 査読有り

    Horide T., Torigoe K., Ishimaru M., Kita R., Awaji S., Matsumoto K.

    Superconductor Science and Technology   33 ( 10 )   2020年10月

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    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)

    Nanoscale pinning centers are introduced into YBa2Cu3O7 (YBCO) films and tapes to improve vortex pinning and critical current density (J c) for coated conductor application. While pinning with a single type of pinning center has been mainly investigated, hybrid pinning with multiple types of pinning center is expected to be more promising for simultaneously achieving high J c values and suppressing J c anisotropy. In the present study, a three-phase-nanocomposite film consisting of an YBCO matrix, BaHfO3 nanorods and Y-O nanoparticles was fabricated. A global pinning force maximum (F p,max, where F p = J c B) of 1.57 TN m-3 at 4.2 K, which is as high as the record level of F p,max, was achieved by the hybrid pinning of BaHfO3 nanorods and Y-O nanoparticles. Furthermore, the hybrid pinning improved the angular dependence of J c. The pinning contribution from nanoparticles increased with lowering temperature, which can explain the high J c at low temperature. Thus, the present study successfully demonstrates a highly effective structure that can simultaneously achieve suppressed J c anisotropy and a record level of J c.

    DOI: 10.1088/1361-6668/aba544

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  • 機械学習で新しい超伝導物質を探索する:21世紀版マティアス則への期待 査読有り

    松本 要, 堀出 朋哉

    応用物理 ( 公益社団法人 応用物理学会 )   89 ( 4 )   222 - 226   2020年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    <p>初期の超伝導物質探索においてマティアス則が活躍した.マティアス則とは,遷移金属およびその合金の臨界温度<i>T</i><sub>c</sub>がある特定の物質パラメータの組み合わせにおいて極大になるという経験則で,多くの超伝導物質の発見につながった.ところが最近,計算機パワーの進展に伴い,全く新しい経験的な<i>T</i><sub>c</sub>予測法が生みだされる可能性がある.それは最新の超伝導データベースと人工知能技術の一種である機械学習を用いて,計算機に既知物質の<i>T</i><sub>c</sub>実験値とその元素の組み合わせを学習させ,得られた学習モデルを未知物質の元素の組み合わせに適用して<i>T</i><sub>c</sub>を予測する手法である.これは強いていえば,21世紀版のマティアス則と呼ばれるようなもので,本稿は,この新しい超伝導物質探索手法に関するものである.</p>

    DOI: 10.11470/oubutsu.89.4_222

    CiNii Article

    その他リンク: https://ci.nii.ac.jp/naid/130007830127

  • Deposition-temperature dependence of vortex pinning property in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7</inf>+BaHfO<inf>3</inf> films 査読有り

    Horide T., Torigoe K., Kita R., Nakamura R., Ishimaru M., Awaji S., Matsumoto K.

    Materials Transactions ( 公益社団法人 日本金属学会 )   61 ( 3 )   449 - 454   2020年01月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2020 The Japan Institute of Metals and Materials. Improvement of critical current density (Jc) in magnetic fields is required in YBa2Cu3O7 films, and process parameters should be optimized for controlling pinning centers. In the present study, a deposition temperature was varied in pulsed laser deposition of YBa2Cu3O7+BaHfO3 films to control the nanorod structure, and its influence on Jc was analyzed. The YBa2Cu3O7+BaHfO3 film deposited at 850°C exhibited pinning force maximum (Fp,max.) as high as 413GN/m3 at 40 K, while the Fp,max. for the deposition temperature of 850°C at 77K was smaller than that in the YBa2Cu3O7+BaHfO3 film deposited at 900°C. A critical temperature decreased and matching field increased with decreasing the deposition temperature. Increase in deposition temperature is effective in improving the Fp,max. in high temperatures, since the critical temperature and matching field dependences of Jc value dominate the Fp,max. On the other hand, low deposition temperature improves the Fp,max. in low temperatures since the Fp shift in accordance with matching field is dominant to the Fp,max. Thus, the deposition temperature should be set in pulsed laser deposition of YBa2Cu3O7 films containing nanorods considering the Jc variation with critical temperature and matching field.

    DOI: 10.2320/matertrans.MT-M2019303

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  • YBa2Cu3O7 ナノコンポジット薄膜における磁束ピンニング制御 査読有り

    堀出 朋哉

    まてりあ ( 公益社団法人 日本金属学会 )   58 ( 10 )   563 - 569   2019年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)

    DOI: 10.2320/materia.58.563

    CiNii Article

    その他リンク: https://ci.nii.ac.jp/naid/130007721871

  • 成膜温度を変化させて作製した YBa2Cu3O7+BaHfO3薄膜の磁束ピンニング特性 査読有り

    堀出 朋哉, 鳥越 健太, 喜多 隆介, 中村 亮太, 石丸 学, 淡路 智, 松本 要

    Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals ( 公益社団法人 日本金属学会 )   83 ( 9 )   320 - 326   2019年08月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 The Japan Institute of Metals and Materials. Improvement of critical current density (Jc) in magnetic fields is required in YBa2Cu3O7 films, and process parameters should be optimized for controlling pinning centers. In the present study, a deposition temperature was varied in pulsed laser deposition of YBa2Cu3O7+BaHfO3 films to control the nanorod structure, and its influence on Jc was analyzed. The YBa2Cu3O7+BaHfO3 film deposited at 850°C exhibited pinning force maximum(Fp,max) as high as 413 GN/m3 at 40 K, while the Fp,max for the deposition temperature of 850°C at 77 K was smaller than that in the YBa2Cu3O7+BaHfO3 film deposited at 900°C. A critical temperature decreased and matching field increased with decreasing the deposition temperature. Increase in deposition temperature is effective in improving the Fp,max in high temperatures, since the critical temperature and matching field dependences of Jc value dominate the Fp,max. On the other hand, low deposition temperature improves the Fp,max in low temperatures since the Fp shift in accordance with matching field is dominant to the Fp,max. Thus, the deposition temperature should be set in pulsed laser deposition of YBa2Cu3O7 films containing nanorods considering the Jc variation with critical temperature and matching field.

    DOI: 10.2320/jinstmet.JA201902

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  • Thermoelectric Property in Orthorhombic-Domained SnSe Film 査読有り

    Horide T., Murakami Y., Hirayama Y., Ishimaru M., Matsumoto K.

    ACS Applied Materials and Interfaces   11 ( 30 )   27057 - 27063   2019年07月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 American Chemical Society. Single-crystal SnSe exhibits extremely high thermoelectric properties, and fabrication of SnSe films is promising for practical application and basic research on properties. However, the high thermoelectric properties have not yet been reported in SnSe films and their thermoelectric properties and nanostructure have not yet been analyzed in detail. In the present study, a-axis-oriented epitaxial SnSe films were prepared to discuss the thermoelectric properties of the SnSe films. While the electrical conductivity of the films was orders of magnitude smaller than that in the single crystals at room temperature, surprisingly, the thermoelectric property (power factor) of the films was slightly higher than that in the single crystals at high temperatures (∼300 °C). The SnSe films contained orthorhombic domain boundaries with a spacing of several hundred nanometers. The orthorhombic domain boundaries caused carrier scattering and degraded the mobility of the films at room temperature, but their effect decreased with increasing temperature. Thus, the carrier scattering at domain boundaries results in characteristic temperature dependence of thermoelectric properties in the SnSe films. High thermoelectric properties at high temperatures were successfully achieved in the SnSe films in spite of the existence of domain boundaries, demonstrating the possibility of high-performance of SnSe thermoelectric films.

    DOI: 10.1021/acsami.9b04868

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  • Observation of inhomogeneous depinning in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7</inf> composite multilayers 査読有り

    Horide T., Ishimaru M., Matsumoto K.

    Superconductor Science and Technology   32 ( 8 )   2019年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 IOP Publishing Ltd. Composite multilayer films (CMLs) comprising YBa2Cu3O7 + BaHfO3 (4.7 vol%)/YBa2Cu3O7 + BaHfO3 (3.1 vol%) were fabricated, and vortex behavior in the CMLs was evaluated to discuss inhomogeneous depinning of vortices. Magnetic field and angular dependences of critical current density (J c) in the CMLs were similar to those in the YBa2Cu3O7 + BaHfO3 (4.7 vol%) single layer film (SL). Variation of the CML structure shifted the matching field effect in global pinning force and irreversibility temperature. The J c in the YBa2Cu3O7 + BaHfO3 (4.7 vol%) SL was smaller than that in the YBa2Cu3O7 + BaHfO3 (3.1 vol%) SL, suggesting that vortices preferentially moved along the low-J c layers in the CMLs. The high-J c layers pinned the vortices in the low-J c layers, resulting in a shift of the matching field effect. These observations are characteristic of inhomogeneous depinning of vortices in the CMLs. The inhomogeneous depinning as well as pinned configuration should be considered for understanding J c and for structural design of pinning centers in YBa2Cu3O7 films.

    DOI: 10.1088/1361-6668/ab1d2c

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  • An acceleration search method of higher T<inf>c</inf> superconductors by a machine learning algorithm 査読有り

    Matsumoto K., Horide T.

    Applied Physics Express   12 ( 7 )   2019年06月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 The Japan Society of Applied Physics. We propose a method to efficiently search for superconductors with higher critical temperature T c by machine learning based on a superconductor database. The T c prediction and the search for new superconductors are still difficult problems. With the progress of computer power and calculation algorithms, the possibility of finding new materials with higher T c at high throughput is emerging. Using the obtained T c prediction model, the scope is expanded to the search space of multielement materials that have never been searched, and candidates for superconductors with higher T c that can be synthesized are proposed.

    DOI: 10.7567/1882-0786/ab2922

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  • Nonlocal self-organization of long stacking faults from highly strained nanocomposite film of complex oxide 査読有り

    Horide T., Ishimaru M., Sato K., Matsumoto K.

    Physical Review Materials   3 ( 1 )   2019年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2019 American Physical Society. Elastic strain and defects are important key words for controlling structure and properties in films. While epitaxial strain and misfit dislocations have been discussed in conventional films, the evolution of strain and defect can be significantly varied by nanocomposite strain and complicated defects in oxides. In the present study, long stacking faults with a spacing of 5-30 nm and a length of >500nm were self-organized by ex situ annealing highly strained nanocomposite films of YBa2Cu3O7-δ(YBCO)+BaMO3(M=Hf,Sn). It is surprising that the nonlocal nature of stacking faults, namely, the structural correlation over >500nm, was observed in spite of the local configuration of the nanocomposite interface. This kind of structural variation was not observed in the pure YBCO film without nanorods, even when the same annealing was performed. A strain energy analysis showed that the stacking fault formation led to the strain energy minimum by reducing the nanocomposite strain. The layered structure of YBCO stacking faults and the large nanocomposite strain realized the present nonlocal self-organization, which is not observed in the conventional systems with epitaxial strain and misfit dislocations.

    DOI: 10.1103/PhysRevMaterials.3.013403

    Scopus

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  • Paramagnetic and Glass States of a YBCO Film Containing Nanorods at Low Magnetic Fields 査読有り

    Deguchi H., Harada A., Yamada T., Mito M., Horide T., Matsumoto K.

    Journal of Physics: Conference Series   1054 ( 1 )   2018年07月

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    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)

    © Published under licence by IOP Publishing Ltd. The magnetic properties of YBa2Cu3O7-x(YBCO) multilayered film containing BaHfO3(BHO) nanorods at zero and small fields have been investigated. The dc magnetization and the ac susceptibility were measured with a SQUID magnetometer. The paramagnetic magnetization is shown after the field-cool-warming below the transition temperature Tc= 87 K. The nonlinear susceptibility had a large peak around Tc, which reflects a glass-transition. An aging effect occured in the relaxation of zero-field-cooled magnetization below the Tc. Paramagnetic behavior and magnetic-glass properties were observed in the YBCO multilayered film containing BHO nanorods. The results suggest that the YBCO multilayered film is a novel magnetic-glass system at low fields.

    DOI: 10.1088/1742-6596/1054/1/012026

    Scopus

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  • Geometric and compositional factors on critical current density in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ</inf>films containing nanorods 査読有り

    Horide T., Nagao S., Izutsu R., Ishimaru M., Kita R., Matsumoto K.

    Superconductor Science and Technology   31 ( 6 )   2018年05月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2018 IOP Publishing Ltd. Critical current density (Jc) was investigated in YBa2Cu3O7-δfilms containing nanorods prepared with various nanorod materials, with variation of nanorod content, substrate temperature, and oxidization condition. Three types of compositional situation were realized: films containing strain induced oxygen vacancies; fully oxidized films containing cation compositional deviation; and oxygen deficient films. Normalized Jc-B behavior was determined via the matching field, which is a geometric factor, regardless of the compositional details. A Jc-critical temperature (Tc) relation depending on distribution and fraction of compositional deviation (cation compositional deviation and strain induced oxygen vacancies) was found: the Jcvalues decreased with decreasing Tcdue to the effect of Tcon nanorod pinning strength in the fully oxidized films; Jcdecreased with decreasing oxygen pressure in the film cooling process after film deposition in spite of Tcremaining almost the same, due to reduction of the effective area for current flow in the oxygen deficient films. Thus, a Jclandscape based on geometric and compositional factors was obtained. The study highlights the importance of the Jc-Tcanalysis in the understanding of Jcin YBa2Cu3O7-δfilms containing nanorods.

    DOI: 10.1088/1361-6668/aabe68

    Scopus

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  • Temperature dependence of critical currents in REBCO thin films with artificial pinning centers 査読有り

    Matsumoto K., Nishihara M., Kimoto T., Horide T., Jha A., Yoshida Y., Awaji S., Ichinose A.

    Superconductor Science and Technology   30 ( 10 )   2017年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 IOP Publishing Ltd. Conventionally, δT c type (order parameter modulation) and δl type (mean free path modulation) pinning mechanisms have been proposed to explain the temperature dependence of the flux pinning of superconducting materials. According to previous studies, it is assumed that the temperature dependence of J c of REBa 2 Cu 3 O 7 (REBCO, RE =Y, Gd, Sm, etc) films without artificial pinning centers (APCs) is δl type, but it is unidentified when APCs are introduced into the films. In this paper, GdBCO thin films doped with BaHfO 3 (BHO) deposited on LaAlO 3 substrates by pulsed laser deposition were studied. A target exchange method was used to alternately ablate two targets of pure GdBCO and BHO for introducing nanorods as APCs into GdBCO films. Since the insulative BHO acts as a strong pinning center, the δT c pinning mechanism is expected for the temperature dependence of J c of these thin films. However, the experimental results showed that the J c of the films with BHO nanorods was determined by the δl pinning mechanism over a wide temperature range. In order to explain these unexpected results, we examined the pinning mechanism by nanorods based on a resultant pinning force model.

    DOI: 10.1088/1361-6668/aa835b

    Scopus

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  • Isotropic enhancement in the critical current density of YBCO thin films incorporating nanoscale Y<inf>2</inf>BaCuO<inf>5</inf>inclusions 査読有り

    Jha A., Matsumoto K., Horide T., Saini S., Mele P., Ichinose A., Yoshida Y., Awaji S.

    Journal of Applied Physics   122 ( 9 )   2017年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 Author(s). The effect of incorporation of nanoscale Y 2 BaCuO 5 (Y211) inclusions on the vortex pinning properties of YBa 2 Cu 3 O 7-δ (YBCO or Y123) superconducting thin films is investigated in detail on the basis of variation of critical current density (J C ) with applied magnetic field and also with the orientation of the applied magnetic field at two different temperatures: 77 K and 65 K. Surface modified target approach is employed to incorporate nanoscale Y211 inclusions into the superconducting YBCO matrix. The efficiency of Y211 nanoinclusions in reducing the angular anisotropy of critical current density is found to be significant. The observed angular dependence of the critical current density is discussed on the basis of mutually occupied volume by a vortex and spherical and/or planar defect. A dip in J C near the ab-plane is also observed which has been analyzed on the basis of variation of pinning potential corresponding to a spherical (3-D) or planar (2-D) pinning center and has been attributed to a reduced interaction volume of the vortices with a pinning center and competing nature of the potentials due to spherical and planar defects.

    DOI: 10.1063/1.5001273

    Scopus

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  • Strong c-axis correlated pinning and hybrid pinning in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ</inf> films containing BaHfO<inf>3</inf> nanorods and stacking faults 査読有り

    Horide T., Otsubo K., Kita R., Matsukida N., Ishimaru M., Awaji S., Matsumoto K.

    Superconductor Science and Technology   30 ( 7 )   074009   2017年06月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    © 2017 IOP Publishing Ltd.High critical current density (Jc) was achieved in low temperatures of 40 and 20 K in YBa2Cu3O7-δ films containing elongated BaHfO3 nanorods and stacking faults, which were prepared using pulsed laser deposition and post-oxygen-annealing. The YBa2Cu3O7-δ + BaHfO3 film exhibited global pinning force maximum (Fp,max) of 312 GNm-3 at 40 K and 619 GNm-3 at 20 K due to strong pinning by nanorods. These Fp,max values are comparable to those in the previously-reported high-Jc films with almost the same matching field. Thus, the present study demonstrated that YBa2Cu3O7-δ superconducting matrix realized high Jc in low temperatures like other REBa2Cu3O7-δ (RE = Gd, Sm, (Gd, Y)). Furthermore, high Jc was obtained also for magnetic field parallel to the ab-plane, indicating hybrid pinning of nanorods and stacking faults. Thus, the stacking faults significantly affected the Jc properties in the YBa2Cu3O7-δ films containing nanorods.The present film structure with strong c-axis correlated pinning and hybrid pinning is effective in simultaneous control of Jc values and Jc anisotropy in YBa2Cu3O7-δ films.

    DOI: 10.1088/1361-6668/aa70d3

    Scopus

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  • Structural Evolution Induced by Interfacial Lattice Mismatch in Self-Organized YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ</inf> Nanocomposite Film 査読有り

    Horide T., Kametani F., Yoshioka S., Kitamura T., Matsumoto K.

    ACS Nano   11 ( 2 )   1780 - 1788   2017年02月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    Intriguing properties of self-organized nanocomposites of perovskite oxides are usually derived from the complex interface of constituent material phases. A sophisticated control of such a system is required for a broad range of energy and device applications, which demand a comprehensive understanding of the interface at the atomic scale. Here, we visualized and theoretically modeled the highly elastically strained nanorod, the interface region with misfit dislocations and heterointerface distortion, and the matrix with strain-induced oxygen vacancies in the self-organized YBa2Cu3O7-δ nanocomposite films with Ba perovskite nanorods. Large misfit strain was elastically accommodated in the nanocomposites, but since the elastic strain was mainly accommodated by the nanorods, the concentration of strain-induced oxygen vacancies was small enough for the matrix to keep high critical temperature (>85 K). The interfacial bonding distorted the atomic structure of YBa2Cu3O7-δ, but the thickness of distortion was limited to a few unit cells (less than the coherence length) due to the electron screening. The effect of volume fraction on elastic strain and the electron screening are crucial for strong vortex pinning without significant degradation of both the elementary pinning force and critical temperature in the nanocomposites. Thus, we comprehensively clarified the self-organized nanocomposite structure for on-demand control of superconductivity and oxide functionality in the nanocomposite engineering of perovskite oxides.

    DOI: 10.1021/acsnano.6b07716

    Scopus

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  • Uniaxial strain effects on the superconducting transition in Re-doped Hg-1223 cuprate superconductors 査読有り

    Mito M., Ogata K., Goto H., Tsuruta K., Tsuruta K., Nakamura K., Deguchi H., Horide T., Matsumoto K., Tajiri T., Hara H., Ozaki T., Ozaki T., Takeya H., Takano Y.

    Physical Review B   95 ( 6 )   2017年02月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    The effects of uniaxial strain and hydrostatic pressure on Hg0.83Re0.18Ba2Ca2.4Cu3.6O14[Hg0.83(Re0.18)-1223] were investigated by ac magnetic measurements under stress corresponding to a pressure of 20 GPa at maximum. According to a previous thermal study based on the Ehrenfest relation, in-plane contraction should increase the superconducting transition temperature Tc, whereas out-of-plane contraction should decrease Tc. This suggests that the increase in Tc under hydrostatic-pressure contraction must be smaller than that under in-plane contraction. However, the present uniaxial-strain experiments revealed enhancement of Tc under both in-plane and out-of-plane contraction, and the largest enhancement was observed under hydrostatic-pressure contraction. According to a band calculation, all contraction styles induce hole doping from the HgO blocks to the CuO2 blocks, and hydrostatic-pressure contraction yields the largest hole doping among three contractions. This behavior explains well a series of changes in Tc in the stress region of below 8 GPa. More specifically, under hydrostatic-pressure contraction, Tc exhibited an increase, a decrease, and another increase with increasing pressure, and this multistep change is similar to that observed in Bi-2223-type cuprate superconductors, suggesting that it is necessary to distinguish the effect of strain on the middle CuO2 plane in the three-CuO2-plane package from that on the outer planes.

    DOI: 10.1103/PhysRevB.95.064503

    Scopus

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  • Pin potential effect on vortex pinning in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ</inf> films containing nanorods: Pin size effect and mixed pinning 査読有り

    Horide T., Matsukida N., Ishimaru M., Kita R., Awaji S., Matsumoto K.

    Applied Physics Letters   110 ( 5 )   052601   2017年01月

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    担当区分:責任著者   記述言語:英語   掲載種別:研究論文(学術雑誌)

    The pin size effect and mixed pinning of nanorods and matrix defects are discussed for YBa2Cu3O7-δ films containing nanorods. BaSnO3 nanorods with a diameter of 11 nm and BaHfO3 nanorods with a diameter of 7 nm were prepared, and critical current density (Jc) and resistivity were measured in the films. When the coherence length was larger than the nanorod size at high temperatures near the critical temperature, the trapping angle and activation energy of the vortex flow depended on the nanorod diameter. At a moderate temperature of 65−77 K, the pin size effect on Jc disappeared since the coherence length became smaller than the nanorod size. At a low temperature of 20 K, the contribution from matrix pinning became comparable to that of nanorods in a high magnetic field due to the small coherence length. Thus, the temperature-dependent coherence length caused the pin potential situation to vary significantly, namely, the pin size effect and mixed pinning, which strongly affected vortex pinning in YBa2Cu3O7-δ containing nanorods.

    DOI: 10.1063/1.4975300

    Scopus

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  • Hybrid artificial pinning centers of elongated-nanorods and segmented-nanorods in YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7</inf> films 査読有り

    Horide T., Sakamoto N., Ichinose A., Otsubo K., Kitamura T., Matsumoto K.

    Superconductor Science and Technology   29 ( 10 )   105010   2016年09月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    To control the anisotropy of critical current density (J c), hybrid artificial pinning centers (APCs) of elongated-nanorods and segmented-nanorods were incorporated into YBa2Cu3O7 films. The elongated-nanorods and segmented-nanorods were formed by fabricating multilayer films using YBa2Cu3O7+BaSnO3 targets with a different BaSnO3 content. According to the elastic calculation, the BaSnO3-free YBa2Cu3O7 regions between BaSnO3 segmented-nanorods were highly strained, resulting in their alignment along the c-axis. Pinning of the vortex kinks and straight vortices by the nanorod ends improved J c in a wide range around B//ab. The angular dependence of J c systematically varied with the multilayer structure of layer thickness and BSO content. J c depended on the layer thickness even with keeping the constant average BSO content, showing that the BaSnO3 distribution, as well as the average BaSnO3 content, affected the J c. The hybrid pinning effect of elongated-nanorods and nanorod ends improved the J c anisotropy although the effect was not so large in the present films. The control of strain and interface is expected to lead to further improvement of J c.

    DOI: 10.1088/0953-2048/29/10/105010

    Scopus

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  • ハイブリッドAPC による高性能YBCO テープ線材の開発 査読有り

    堀出 朋哉, 河村 武宏, 原 和輝, 松本 要, 一瀬 中, 吉積 正晃, 和泉 輝郎, 塩原 融

    低温工学 ( 公益社団法人 低温工学・超電導学会 (旧 社団法人 低温工学協会) )   49 ( 3 )   105 - 112   2014年01月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)

    YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7</sub>(YBCO) films containing hybrid artificial pinning centers(APCs) of BaSnO<sub>3</sub>(BSO) nanorods and Y<sub>2</sub>O<sub>3</sub> nanoparticles were fabricated on ion beam assisted deposition(IBAD)-MgO substrates. By changing contents of BSO and Y<sub>2</sub>O<sub>3</sub>, critical current density (<i>J</i><sub>c</sub>) properties were controlled. The YBCO film containing high density of BSO and Y<sub>2</sub>O<sub>3</sub> exhibited high <i>J</i><sub>c</sub> in high magnetic fields, and an isotropic angular dependence of <i>J</i><sub>c</sub> was obtained in a low magnetic field in a film containing moderate density of nanorods and nanoparticles, showing that hybrid APCs have the potential to improve <i>J</i><sub>c</sub> performance. BSO content is the most crucial factor for <i>F</i><sub>p,max</sub> in a magnetic field parallel to the <i>c</i>-axis, and Y<sub>2</sub>O<sub>3</sub> nanoparticles can significantly improve <i>F</i><sub>p,max</sub> in a magnetic field tilted from the <i>c</i>-axis. Advanced control of nanorods and nanoparticles is needed for realization of higher <i>J</i><sub>c</sub> performance.

    DOI: 10.2221/jcsj.49.105

    CiNii Article

    その他リンク: https://ci.nii.ac.jp/naid/130004457532

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口頭発表・ポスター発表等

  • Ba2YbNbO6ナノロッドの導入によるYBCO薄膜の臨界電流密度 向上

    吉田 悠雅, 堀出 朋哉, 喜多 隆介, 石丸学, 松本 要

    第82回応用物理学会秋季学術講演会  応用物理学会

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    開催期間: 2021年09月12日   記述言語:日本語   開催地:オンライン  

  • BHOを添加したREBCO被覆導体の最適化と酸素ポストアニーリング効果

    栗林 晃宏、梶村 広之、松本 要、堀出 朋哉、一瀬 中

    第82回応用物理学会秋季学術講演会  応用物理学会

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    開催期間: 2021年09月12日   記述言語:日本語   開催地:オンライン  

  • ポストアニールによるZnMnGaO4薄膜のナノチェッカーボード構造の制御

    森下和樹, 堀出朋哉, 堀部陽一, 石丸学, 松本要

    第82回応用物理学会秋季学術講演会  応用物理学会

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    開催期間: 2021年09月12日   記述言語:日本語   開催地:オンライン  

  • ダブルペロブスカイト型ナノロッドを導入したYBa2Cu3O7-y薄膜の極微構造解析

    権藤 匡哉、石丸 学、堀出 朋哉、松本 要、喜多 隆介

    第82回応用物理学会秋季学術講演会  応用物理学会

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    開催期間: 2021年09月12日   記述言語:日本語   開催地:オンライン  

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    清水 健志、前田 浩太郎、松本 要、堀出 朋哉、富田 優

    第82回応用物理学会秋季学術講演会  応用物理学会

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    開催期間: 2021年09月12日   記述言語:日本語   開催地:オンライン  

  • CaをドーピングしたGdBa2Cu3O7-x 超伝導薄膜の臨界電流特性

    水野光樹, アロク・クマール・ジャー, 堀出朋哉, 松本要

    2021年度日本金属学会・日本鉄鋼協会・軽金属学会九州支部・合同学術講演会  日本金属学会、日本鉄鋼協会、軽金属学会九州支部

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    開催期間: 2021年06月11日   記述言語:日本語   開催地:オンライン  

  • 半田接合したREBCO線材の多点I-V測定によるカレントトランスファー解析

    清水健志, 前田浩太郎, 松本要, 堀出朋哉

    2021年度日本金属学会・日本鉄鋼協会・軽金属学会九州支部・合同学術講演会  日本金属学会、日本鉄鋼協会、軽金属学会九州支部

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    開催期間: 2021年06月11日   記述言語:日本語   開催地:オンライン  

  • PLD法を用いたZnMnGaO4ナノチェッカーボード薄膜の作製

    森下和樹, 堀出朋哉, 堀部陽一, 石丸学, 松本要

    2021年度日本金属学会・日本鉄鋼協会・軽金属学会九州支部・合同学術講演会  日本金属学会、日本鉄鋼協会、軽金属学会九州支部

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    開催期間: 2021年06月11日   記述言語:日本語   開催地:オンライン  

  • パルスレーザー堆積時のレーザー周波数およびポスト酸素アニールのBa2LuNbO6添加YBa2Cu3O7-y薄膜構造に及ぼす影響

    東賢人, 権藤匡哉, 石丸学, 堀出朋哉, 松本要, 喜多隆介

    2021年度日本金属学会・日本鉄鋼協会・軽金属学会九州支部・合同学術講演会  日本金属学会、日本鉄鋼協会、軽金属学会九州支部

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    開催期間: 2021年06月11日   記述言語:日本語   開催地:オンライン  

  • Ba2LuNbO6およびBa2YbNbO6添加YBa2Cu3O7-y薄膜の極微構造解析

    権藤匡哉, 石丸学, 堀出朋哉, 松本要, 喜多隆介

    2021年度日本金属学会・日本鉄鋼協会・軽金属学会九州支部・合同学術講演会  日本金属学会、日本鉄鋼協会、軽金属学会九州支部

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    開催期間: 2021年06月11日   記述言語:日本語   開催地:オンライン  

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    吉田悠雅, 堀出朋哉, 石丸学, 松本要, 喜多隆介

    2021年度日本金属学会・日本鉄鋼協会・軽金属学会九州支部・合同学術講演会  日本金属学会、日本鉄鋼協会、軽金属学会九州支部

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    開催期間: 2021年06月11日   記述言語:日本語   開催地:オンライン  

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    重藤秋河, 堀出朋哉, 松本要

    2021年度日本金属学会・日本鉄鋼協会・軽金属学会九州支部・合同学術講演会  日本金属学会、日本鉄鋼協会、軽金属学会九州支部

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    開催期間: 2021年06月11日   記述言語:日本語   開催地:オンライン  

  • 透過電子顕微鏡法によるダブルペロブスカイトBa2LuNbO6ナノロッドを導入したYBa2Cu3O7-y薄膜の極微構造解析

    権藤 匡哉、吉田 将司、石丸 学、堀出 朋哉、松本 要、喜多 隆介

    第81回応用物理学会秋季学術講演会  応用物理学会

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    開催期間: 2020年09月09日   記述言語:日本語   開催地:オンライン  

  • JC control by hybrid pinning of nanorods and nanoparticles in YBa2Cu3O7-x film

    Kenta Torigoe, Tomoya Horide, Kaname Matsumoto, Ryusuke Kita, Satoshi Awaji

    ISS2019 

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    開催期間: 2019年12月03日 - 2019年12月05日   記述言語:英語   開催地:みやこめっせ  

  • PLDを用いたZnMnGaO4ナノチェッカーボード薄膜の作製

    臼木 美弥, 堀出 朋哉, 堀部 陽一, 松本 要

    2019 第80回 応用物理学会 秋季学術講演会  応用物理学会

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    開催期間: 2019年09月18日 - 2019年09月21日   記述言語:日本語   開催地:北海道大学 札幌キャンパス  

  • パルスレーザー法により作製したSnSe薄膜の透過電子顕微鏡観察

    平山 喜基、石丸 学、松本 要、堀出 朋哉

    2019 第80回 応用物理学会 秋季学術講演会  応用物理学会

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    開催期間: 2019年09月18日 - 2019年09月21日   記述言語:日本語   開催地:北海道大学 札幌キャンパス  

  • 人工ピンを導入したYBa2Cu3O7-y薄膜の透過電子顕微鏡観察に及ぼす試料膜厚および温度の影響

    吉田 将司、石丸 学、堀出 朋哉、松本 要

    2019 第80回 応用物理学会 秋季学術講演会  応用物理学会

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    開催期間: 2019年09月18日 - 2019年09月21日   記述言語:日本語   開催地:北海道大学 札幌キャンパス  

  • 機械学習による高Tc超伝導物質探索 ― 軽元素の効果

    松本 要、堀出 朋哉

    2019 第80回 応用物理学会 秋季学術講演会  応用物理学会

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    開催期間: 2019年09月18日 - 2019年09月21日   記述言語:日本語   開催地:北海道大学 札幌キャンパス  

  • Vortex pinning improved by stacking faults in YBCO films containing nanorods: interface control and hybrid pinning

    Tomoya Horide, Manabu Ishimaru, Kaname Matsumoto

    EUCAS2019 

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    開催期間: 2019年09月01日 - 2019年09月05日   記述言語:英語   開催地:Scottish Event Campus  

  • Analysis of angular dependent Jc of REBCO coated conductors with APCs

    Kaname Matsumoto, Yutaka Yoshida, Satoshi Awaji, Yuji Tsuchiya, Tomoya Horide, Alok Jha

    EUCAS2019 

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    開催期間: 2019年09月01日 - 2019年09月05日   記述言語:英語   開催地:Scottish Event Campus  

  • ナノロッドセグメント化によるYBa2Cu3O7-x薄膜の臨界電流密度制御

    鳥越 健太, 堀出 朋哉, 松本 要

    第7回(2018秋)低温工学・超電導学会研究発表会  低温工学・超電導学会

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    開催期間: 2018年11月19日 - 2018年11月21日   記述言語:日本語   開催地:山形テルサ  

  • Atomic scale design of YBCO nanocomposite films for improving Tc and fp factors in Jc

    Tomoya Horide, Kaname Matsumoto, Fumitake Kametani

    ASC 2018  ASC 2018

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    開催期間: 2018年10月28日 - 2018年11月02日   記述言語:英語   開催地: the Washington State Convention Center  

  • 超伝導特性制御を目指した FeSe+SrTiO3ナノコンポジット薄膜の作製

    戸倉 史暁 , 堀出 朋哉 , 松本 要 , 一瀬 中

    2018年第79回応用物理学会秋季学術講演会  応用物理学会

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    開催期間: 2018年09月18日 - 2018年09月21日   記述言語:日本語   開催地:名古屋国際会議場  

▼全件表示

担当授業科目(学内)

  • 2021年度   材料物理数学

  • 2021年度   電子・磁性材料

  • 2021年度   マテリアル工学PBL

  • 2021年度   薄膜材料学特論

  • 2021年度   フロンティア工学実習

  • 2020年度   薄膜材料学特論

  • 2020年度   電子・磁性材料

  • 2019年度   薄膜材料学特論

  • 2019年度   電子・磁性材料

  • 2018年度   薄膜材料学特論

  • 2018年度   電子・磁性材料

▼全件表示