MATSUHIRA Kazuyuki

写真a

Title

Professor

Laboratory

1-1 Sensui-cho, Tobata-ku, Kitakyushu-shi, Fukuoka

Research Fields, Keywords

Solid State Physics, Low Temperature Physics, Magnetism

Undergraduate Education 【 display / non-display

  • 1992.03   Hokkaido University   Faculty of Science   Graduated   JAPAN

Post Graduate Education 【 display / non-display

  • 1997.03  Hokkaido University  Graduate School, Division of Natural Science  Doctoral Program  Completed  JAPAN

Degree 【 display / non-display

  • Hokkaido University -  Doctor of Science  1997.03

Biography in Kyutech 【 display / non-display

  • 2018.06
    -
    Now

    Kyushu Institute of TechnologyFaculty of Engineering   Department of Electrical Engineering and Electronics   Professor  

  • 2012.07
    -
    2018.05

    Kyushu Institute of TechnologyFaculty of Engineering   Department of Electrical Engineering and Electronics   Associate Professor  

  • 2008.04
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    2012.06

    Kyushu Institute of TechnologyFaculty of Engineering   Assistant Professor  

Biography before Kyutech 【 display / non-display

  • 1999.05
    -
    2001.03

      Research Assistant   JAPAN

  • 1996.04
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    1998.03

      Special researcher of the Japan Society for the Promotion of Science   JAPAN

Academic Society Memberships 【 display / non-display

  • 1993.03
    -
    Now
     

    The Physical Society of Japan  JAPAN

  • 2015.11
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    Now
     

    The Institute of Electrical Engineers of Japan  JAPAN

  • 2020.01
    -
    Now
     

    The American Physical Society  UNITED STATES

  • 2016.01
    -
    2016.12
     

    The American Physical Society  UNITED STATES

  • 2011.06
    -
    Now
     

    International Scholarly Research Network Condensed Matter Physics Editorial Board  EGYPT

Specialized Field (scientific research fund) 【 display / non-display

  • Solid State Physics

 

Publications (Article) 【 display / non-display

  • Nuclear spin assisted quantum tunnelling of magnetic monopoles in spin ice

      10 ( 1 )   2019.04  [Refereed]

     View Summary

    © 2019, The Author(s). Extensive work on single molecule magnets has identified a fundamental mode of relaxation arising from the nuclear-spin assisted quantum tunnelling of nearly independent and quasi-classical magnetic dipoles. Here we show that nuclear-spin assisted quantum tunnelling can also control the dynamics of purely emergent excitations: magnetic monopoles in spin ice. Our low temperature experiments were conducted on canonical spin ice materials with a broad range of nuclear spin values. By measuring the magnetic relaxation, or monopole current, we demonstrate strong evidence that dynamical coupling with the hyperfine fields bring the electronic spins associated with magnetic monopoles to resonance, allowing the monopoles to hop and transport magnetic charge. Our result shows how the coupling of electronic spins with nuclear spins may be used to control the monopole current. It broadens the relevance of the assisted quantum tunnelling mechanism from single molecular spins to emergent excitations in a strongly correlated system.

    DOI Scopus

  • A new mathematical approach to finding global solutions of the magnetic structure determination problem

      8 ( 1 )   2018.12  [Refereed]

     View Summary

    © 2018, The Author(s). Determination of magnetic structure is an important analytical procedure utilized in various fields ranging from fundamental condensed-matter physics and chemistry to advanced manufacturing. It is typically performed using a neutron diffraction technique; however, finding global solutions of the magnetic structure optimization problem represents a significant challenge. Generally, it is not possible to mathematically prove that the obtained magnetic structure is a truly global solution and that no solution exists when no acceptable structure is found. In this study, the global optimization technique called semidefinite relaxation of quadratic optimization, which has attracted much interest in the field of applied mathematics, is proposed to use as a new analytical method for the determination of magnetic structure, followed by the application of polarized neutron diffraction data. This mathematical approach allows avoiding spurious local solutions, decreasing the amount of time required to find a tentative solution and finding multiple solutions when they exist.

    DOI Scopus

  • Experimental signature of the attractive Coulomb force between positive and negative magnetic monopoles in spin ice

        1 - 6   2016.03  [Refereed]

    DOI Scopus

  • Far-from-equilibrium monopole dynamics in spin ice

      10   135   5 pages   2014.01  [Refereed]

    DOI Scopus

  • Giant Magnetiresisitance Effect in the Metal-Insulator Transition of Pyrochlore Oxide Nd2Ir2O7

      82 ( 2 ) 023706   4pages   2013.01  [Refereed]

    DOI Scopus CiNii

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Publications (Books) 【 display / non-display

  • 高圧技術を用いたスクッテルダイト化合物の合成と物性 未来を拓く高圧力セミナーシリーズ(29)

    松平和之, 城谷一民, 伊藤英司, 木方邦彦, 滝沢博胤, 関根ちひろ, 清水克哉, 上床美也 ( Joint Work ,  充填スクッテルダイトが示す多様な物性ーリン化合物を中心にー (pp.1-8) )

    日本高圧力学会  2004.07

Conference Prsentations (Oral, Poster) 【 display / non-display

  • Novel Phenomena in Geometrically Frustrated Iridates

    Kazuyuki Matsuhira, Hiroki Hanate, Hironobu Nomura, Naohiro Kishigami, Nakamura Kazuma, Takumi Hasegawa, Satoshi, Tsutsui, Isao Watanabe

    新学術領域J-Physicsの令和元年度領域全体会議  (神戸大学)  2020.01  -  2020.01  新学術領域J-Physics

  • Current-induced Novel Transport Properties in the Geometrically Frustrated Iridate Ca5Ir3O12

    Hiroki Hanate, Junta Kawano, Kazuma Nakamura, Kazuyuki Matsuhira

    新学術領域J-Physicsの令和元年度領域全体会議  (神戸大学)  2020.01  -  2020.01  新学術領域J-Physics

  • Study of Phonon Dispersion in the Geometrically Frustrated Iridate Ca5Ir3O12 with Strong Spin-orbit Interaction

    Naohiro Kishigami, Hiroki Hanate, Takumi Hasegawa, Satoshi Tsutsui, Kazuma Nakamura, Yoshihide Yoshimoto, Sho Haneta, Kazuyuki Matsuhira

    新学術領域J-Physicsの令和元年度領域全体会議  (神戸大学)  2020.01  -  2020.01  新学術領域J-Physics

  • Non-Fermi Liquid Behavior in Transport Properties of Hole-doped Pyrochlore Iridates

    Hironori Nomura, Tomoya Taniguchi, Naoya Kishigami, Eriya Nishikawa and Kazuyuki Matsuhira

    International Conference on Strongly Correlated Electron Systems 2019  (岡山市)  2019.09  -  2019.09 

  • Hole Doping Dependence on Magnetic Ordering of (Eu1-xCax)2Ir2O7 Studied by μSR

    Utami Widyaiswari, Julia Angel, Hironori Nomura, Tomoya Taniguchi, Kazuyuki Matsuhira, Akihiro Koda, Budhy Kurniawan and Isao Watanabe

    International Conference on Strongly Correlated Electron Systems 2019  (岡山市)  2019.09  -  2019.09 

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Lectures 【 display / non-display

  • Metal-Insulator Transitions in Pyrochlore Iridates

    OIST INTERNATIONAL WORKSHOP ON NOVEL QUANTUM MATERIALS AND PHASES ( OIST, Okinawa, Japan )  2014.05.14 

  • Magnetic Properties of the Pyrochlore Iridates

    International Workshop on Frustration and Topology in Condensed Matter Physics ( NCKU, Tainan, Taiwan )  2014.02.16 

  • Metal-Insulator Transition in Pyrochlore Oxide Nd2Ir2O7

    6th International Conference on Highly Frustrated magnetism 2012   2012.06.05  McMaster University

  • パイロクロア酸化物Ln2Ir2O7における金属絶縁体転移

    日本物理学会2016年秋季大会 ( 金沢大学 )  2016.09.14 

  • Spin Dynamics in Spin Ice

    日本物理学会 2013 年秋季大会 シンポジウム「Quantum Spin Ice: Dynamics and Quantum Electrodynamics of Magnetic Monopoles」 ( 徳島大学,日本 )  2013.09.26 

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Honors and Awards 【 display / non-display

  • 21th Outstanding Paper Award of the Physical Society of Japan (2016)

    2016.03.20     JAPAN

    Winner: K. Matsuhira, M. Wakeshima, Y. Hinatsu, S. Takagi, Metal-Insulator Transitions in Pyrochlore Oxides Ln2Ir2O7, J. Phys. Soc. Jpn. 80, 094701 (2011).

  • 22th Outstanding Paper Award of the Physical Society of Japan (2017)

    2017.03.19     JAPAN

    Winner: Hiroaki Kadowaki, Naohiro Doi, Yuji Aoki, Yoshikazu Tabata, Taku J. Sato, Jeffrey W. Lynn, Kazuyuki Matsuhira, and Zenji Hiroi, Observation of Magnetic Monopoles in Spin Ice, J. Phys. Soc. Jpn. 78, 103706 (2009).

 

Activities of Academic societies and Committees 【 display / non-display

  • 2019.06
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    2021.05

    The Institute of Electrical Engineers of Japan  

  • 2016.05
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    2018.05

    The Institute of Electrical Engineers of Japan  

  • 2020.06
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    2022.05

    The Institute of Electrical Engineers of Japan  

  • 2018.06
    -
    2020.05

    The Institute of Electrical Engineers of Japan  

  • 2017.07
    -
    2018.06

    The Institute of Electrical Engineers of Japan  

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