Updated on 2025/02/07

写真a

 
KAWASAKI Shinji
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
Contact information
メールアドレス
Homepage
https://www.physics.okayama-u.ac.jp/zheng_homepage/
External link

Degree

  • D.Sc. ( 2004.3   Osaka University )

  • M.E. ( 2001.3   Osaka University )

Research Interests

  • superconductivity

  • charge density wave

  • magnetism

  • uniaxial stress

  • strongly correlated electron systems

  • high magnetic field

  • Nuclear magnetic resonance / nuclear quadrupole resonance

  • high Tc cuprate

  • heavy fermion systems

  • high pressure

  • strain

Research Areas

  • Natural Science / Magnetism, superconductivity and strongly correlated systems

Education

  • Osaka University   大学院基礎工学研究科   博士後期課程物理系専攻

    2001.4 - 2004.3

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    Country： Japan

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  • Osaka University   大学院基礎工学研究科   博士前期課程物理系専攻

    1999.4 - 2001.3

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    Country： Japan

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  • Osaka University   基礎工学部   物性物理工学科

    1995.4 - 1999.3

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    Country： Japan

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  • 大阪府立高津高等学校    

    1992.4 - 1995.3

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    Country： Japan

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Research History

  • Okayama University   Faculty of Science Department of Physics   Associate Professor

    2013.1

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    Country：Japan

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  • Okayama University   Faculty of Science Department of Physics   senior assistant professor

    2006.4 - 2012.12

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    Country：Japan

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  • Osaka University   Graduate School of Engineering Science

    2005.4 - 2006.3

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    Country：Japan

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  • Osaka University   Graduate School of Engineering Science

    2004.4 - 2005.3

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    Country：Japan

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  • Osaka University   Graduate School of Engineering Science

    2003.4 - 2004.3

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    Country：Japan

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Professional Memberships

Committee Memberships

  • 日本物理学会   会誌編集委員（第８０期～第８１期）  

    2024.4 - 2026.3   

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    Committee type：Academic society

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  • 強相関電子系国際会議SCES2019   現地実行委員  

    2019.9   

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    Committee type：Academic society

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  • 高温超伝導フォーラム   幹事  

    2017.10 - 2019.9   

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    Committee type：Academic society

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  • 日本物理学会   領域８運営委員代表  

    2015.4 - 2015.9   

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    Committee type：Academic society

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  • 日本物理学会   第71-72期代議員  

    2015.3 - 2017.3   

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    Committee type：Academic society

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Papers

  • Structural Analysis under Uniaxial Strain Using Synchrotron Radiation Reviewed

    Akito Kobayashi, Seiya Nita, Nao Tsukuda, Asuka Mine, Hayate Nishigaki, Musashi Yokoyama, Shogo Yoshida, Kazuaki Matano, Shinji Kawasaki, Kenji Ishii, Guo-qing Zheng

    12 ( 5 )   325 - 328   2024.10

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    Authorship：Corresponding author   Language：Japanese   Publishing type：Research paper (bulletin of university, research institution)  

    DOI： 10.18957/rr.12.5.325

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  • Strain-induced long-range charge-density wave order in the optimally doped Bi2Sr2−xLaxCuO6 superconductor Reviewed

    Shinji Kawasaki, Nao Tsukuda, Chengtian Lin, Guo-qing Zheng

    Nature Communications   15   5082   2024.6

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media LLC  

    Abstract

    The mechanism of high-temperature superconductivity in copper oxides (cuprate) remains elusive, with the pseudogap phase considered a potential factor. Recent attention has focused on a long-range symmetry-broken charge-density wave (CDW) order in the underdoped regime, induced by strong magnetic fields. Here by 63,65Cu-nuclear magnetic resonance, we report the discovery of a long-range CDW order in the optimally doped Bi2Sr2−xLaxCuO6 superconductor, induced by in-plane strain exceeding ∣ε∣ = 0.15 %, which deliberately breaks the crystal symmetry of the CuO2 plane. We find that compressive/tensile strains reduce superconductivity but enhance CDW, leaving superconductivity to coexist with CDW. The findings show that a long-range CDW order is an underlying hidden order in the pseudogap state, not limited to the underdoped regime, becoming apparent under strain. Our result sheds light on the intertwining of various orders in the cuprates.

    DOI： 10.1038/s41467-024-49225-w

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    Other Link： https://www.nature.com/articles/s41467-024-49225-w

  • Charge Order and Fluctuations in Bi2Sr2−xLaxCuO6+δ Revealed by 63,65Cu-Nuclear Magnetic Resonance Invited Reviewed

    Shinji Kawasaki, Madoka Ito, Dai Kamijima, Chengtian Lin, Guo-qing Zheng

    Journal of the Physical Society of Japan   90 ( 11 )   111008 - 111008   2021.11

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Physical Society of Japan  

    DOI： 10.7566/jpsj.90.111008

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  • Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh0.5Ir0.5In5 Reviewed

    Shinji Kawasaki, Toshihide Oka, Akira Sorime, Yuji Kogame, Kazuhiro Uemoto, Kazuaki Matano, Jing Guo, Shu Cai, Liling Sun, John L. Sarrao, Joe D. Thompson, Guo-qing Zheng

    Communications Physics   3 ( 1 )   2020.8

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    Authorship：Lead author,　Corresponding author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media {LLC}  

    <jats:title>Abstract</jats:title><jats:p>A fundamental problem posed from the study of correlated electron compounds, of which heavy-fermion systems are prototypes, is the need to understand the physics of states near a quantum critical point (QCP). At a QCP, magnetic order is suppressed continuously to zero temperature and unconventional superconductivity often appears. Here, we report pressure (<jats:italic>P</jats:italic>)-dependent <jats:sup>115</jats:sup>In nuclear quadrupole resonance (NQR) measurements on heavy-fermion antiferromagnet CeRh<jats:sub>0.5</jats:sub>Ir<jats:sub>0.5</jats:sub>In<jats:sub>5</jats:sub>. These experiments reveal an antiferromagnetic (AF) QCP at <jats:inline-formula><jats:alternatives><jats:tex-math>$${P}_{ { \rm{c } } }^{ { \rm{AF } } }=1.2$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
    <mml:msubsup>
    <mml:mrow>
    <mml:mi>P</mml:mi>
    </mml:mrow>
    <mml:mrow>
    <mml:mi>c</mml:mi>
    </mml:mrow>
    <mml:mrow>
    <mml:mi>AF</mml:mi>
    </mml:mrow>
    </mml:msubsup>
    <mml:mo>=</mml:mo>
    <mml:mn>1.2</mml:mn>
    </mml:math></jats:alternatives></jats:inline-formula> GPa where a dome of superconductivity reaches a maximum transition temperature <jats:italic>T</jats:italic><jats:sub>c</jats:sub>. Preceding <jats:inline-formula><jats:alternatives><jats:tex-math>$${P}_{ { \rm{c } } }^{ { \rm{AF } } }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
    <mml:msubsup>
    <mml:mrow>
    <mml:mi>P</mml:mi>
    </mml:mrow>
    <mml:mrow>
    <mml:mi>c</mml:mi>
    </mml:mrow>
    <mml:mrow>
    <mml:mi>AF</mml:mi>
    </mml:mrow>
    </mml:msubsup>
    </mml:math></jats:alternatives></jats:inline-formula>, however, the NQR frequency <jats:italic>ν</jats:italic><jats:sub>Q</jats:sub> undergoes an abrupt increase at <jats:inline-formula><jats:alternatives><jats:tex-math>$${P}_{ { \rm{c } } }^{ { \rm{* } } }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
    <mml:msubsup>
    <mml:mrow>
    <mml:mi>P</mml:mi>
    </mml:mrow>
    <mml:mrow>
    <mml:mi>c</mml:mi>
    </mml:mrow>
    <mml:mrow>
    <mml:mi>*</mml:mi>
    </mml:mrow>
    </mml:msubsup>
    </mml:math></jats:alternatives></jats:inline-formula> = 0.8 GPa in the zero-temperature limit, indicating a change from localized to itinerant character of cerium’s <jats:italic>f</jats:italic>-electron and associated small-to-large change in the Fermi surface. At <jats:inline-formula><jats:alternatives><jats:tex-math>$${P}_{ { \rm{c } } }^{ { \rm{AF } } }$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
    <mml:msubsup>
    <mml:mrow>
    <mml:mi>P</mml:mi>
    </mml:mrow>
    <mml:mrow>
    <mml:mi>c</mml:mi>
    </mml:mrow>
    <mml:mrow>
    <mml:mi>AF</mml:mi>
    </mml:mrow>
    </mml:msubsup>
    </mml:math></jats:alternatives></jats:inline-formula> where <jats:italic>T</jats:italic><jats:sub>c</jats:sub> is optimized, there is an unusually large fraction of gapless excitations well below <jats:italic>T</jats:italic><jats:sub>c</jats:sub> that implicates spin-singlet, odd-frequency pairing symmetry.</jats:p>

    DOI： 10.1038/s42005-020-00418-x

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  • Charge-density-wave order takes over antiferromagnetism in Bi2Sr2−x La x CuO6 superconductors Reviewed

    S. Kawasaki, Z. Li, M. Kitahashi, C. T. Lin, P. L. Kuhns, A. P. Reyes, Guo-qing Zheng

    Nature Communications   8 ( 1 )   2017.11

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    Authorship：Lead author   Language：English   Publishing type：Research paper (scientific journal)   Publisher：Springer Science and Business Media {LLC}  

    <jats:title>Abstract</jats:title><jats:p>Superconductivity appears in the cuprates when a spin order is destroyed, while the role of charge is less known. Recently, charge density wave (CDW) was found below the superconducting dome in YBa<jats:sub>2</jats:sub>Cu<jats:sub>3</jats:sub>O<jats:sub>
    <jats:italic>y</jats:italic>
    </jats:sub> when a high magnetic field is applied perpendicular to the CuO<jats:sub>2</jats:sub> plane, which was suggested to arise from incipient CDW in the vortex cores that becomes overlapped. Here by <jats:sup>63</jats:sup>Cu-nuclear magnetic resonance, we report the discovery of CDW induced by an in-plane field, setting in above the dome in single-layered Bi<jats:sub>2</jats:sub>Sr<jats:sub>2−<jats:italic>x</jats:italic>
    </jats:sub>La<jats:sub>
    <jats:italic>x</jats:italic>
    </jats:sub>CuO<jats:sub>6</jats:sub>. The onset temperature <jats:italic>T</jats:italic><jats:sub>CDW</jats:sub> takes over the antiferromagnetic order temperature <jats:italic>T</jats:italic><jats:sub>N</jats:sub> beyond a critical doping level at which superconductivity starts to emerge, and scales with the pseudogap temperature <jats:italic>T</jats:italic>*. These results provide important insights into the relationship between spin order, CDW and the pseudogap, and their connections to high-temperature superconductivity.</jats:p>

    DOI： 10.1038/s41467-017-01465-9

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MISC

  • 大きいフェルミ面と量子臨界点の協奏が生み出す奇妙な超伝導 Invited Reviewed

    川崎慎司, 鄭国慶

    日本物理学会誌   77 ( 6 )   321   2022.6

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    Authorship：Lead author,　Corresponding author   Language：Japanese  

    DOI： 10.11316/butsuri.77.6_361

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  • 銅酸化物高温超伝導体における擬ギャップと磁場誘起電荷密度波- Bi2Sr2-xLaxCuO6+δの場合- Invited Reviewed

    川崎慎司, 鄭国慶

    日本物理学会誌   73 ( 8 )   558   2018.8

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    Authorship：Lead author,　Corresponding author   Language：Japanese   Publishing type：Article, review, commentary, editorial, etc. (scientific journal)  

    DOI： 10.11316/butsuri.73.8_558

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  • High quality single crystal growth of and NMR measurements for the spin-triplet superconductor K2Cr3As3

    小川晟吾, 三好智己, 俣野和明, 川崎慎司, 稲田佳彦, ZHENG G.-q.

    日本物理学会講演概要集(CD-ROM)   79 ( 1 )   2024

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  • Single Crystal Growth and Characterization of topological superconductor CuxBi2Se3: IV

    西垣颯, 峰明日香, 横山武蔵, 俣野和明, 神戸高志, 川崎慎司, ZHENG G.-q.

    日本物理学会講演概要集(CD-ROM)   77 ( 1 )   2022

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  • Superconductivity and spin fluctuations in non-centrosymmetric superconductor (Nb,Ta)Rh2B2

    俣野和明, 小椋亮, FOUNTAINE Mateo, JESCHKE Harald O., 川崎慎司, ZHENG G.-q.

    日本物理学会講演概要集(CD-ROM)   77 ( 1 )   2022

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Presentations

  • 最適ドープBi2201超伝導体におけるひずみ誘起電荷密度波秩序 : 一軸ひずみ下NMR

    川崎慎司

    京都大学基礎物理学研究所研究会「超伝導研究の発展と広がり」  2023.12.20 

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    Event date： 2023.12.20 - 2023.12.22

    Presentation type：Oral presentation (general)  

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  • 単層型銅酸化物Bi2201超伝導体の一軸ひずみ下NMR

    川崎慎司

    東北大学金属材料研究所 材料科学国際共同利用・共同研究拠点ワークショップ, 強磁場NMR 研究会：20 T 超定常強磁場を用いたNMR による物性研究  2023.12.11 

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    Event date： 2023.12.11 - 2023.12.12

    Presentation type：Oral presentation (general)  

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  • Charge-density-wave order in single-layered Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ superconductor Invited

    S. Kawasaki, D. Kamijima, M. Kitahashi, Z. Li, C. T. Lin, P. L. Kuhns, A. P. Reyes, Guo-qing Zheng

    Spectroscopies in Novel Superconductors (SNS2019)  2019.6.21 

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    Event date： 2019.6.16 - 2019.6.21

    Language：English   Presentation type：Oral presentation (invited, special)  

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  • Charge-Density-Wave Order and Pseudogap in Single Layered Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ Superconductor」

    S. Kawasaki, Z. Li, M. Kitahashi, D. Kamijima, M. Ito, C. T. Lin, P. L. Kuhns, A. P. Reyes, Guo-qing Zheng

    12th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (M2S-2018)  2018.8.23 

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    Event date： 2018.8.19 - 2018.8.24

    Language：English   Presentation type：Oral presentation (general)  

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  • Doping dependence of the charge density wave order in single layered Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$ superconductors revealed by high field NMR Invited

    Shinji Kawasaki

    International Symposium on Frontier of Superconductivity Research (VI)-NMR and $\mu$SR on Unconventional Superconductors-  2016.10.27 

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    Event date： 2016.10.26 - 2016.10.29

    Language：English   Presentation type：Oral presentation (invited, special)  

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Awards

  • APS Outstanding Referee

    2023.2   American Physical Society (APS)  

    Shinji Kawasaki

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    Award type：Honored in official journal of a scientific society, scientific journal  Country：United States

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  • 理学部教育貢献賞

    2014.3   岡山大学理学部  

    川崎慎司

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  • 岡山大学 学長表彰「若手トップリサーチャー研究奨励賞」

    2011.3   岡山大学  

    川崎慎司

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Research Projects

  • 精密一軸結晶ひずみ制御による非従来型超伝導と背景秩序/揺らぎの起源解明

    Grant number：23K03323  2023.04 - 2026.03

    日本学術振興会  科学研究費助成事業  基盤研究(C)

    川崎 慎司

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    Grant amount：\4680000 （ Direct expense: \3600000 、 Indirect expense：\1080000 ）

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  • 一軸ひずみ応答による銅酸化物高温超伝導と背景電荷密度波秩序/揺らぎの起源解明

    2022.01 - 2022.12

    公益財団法人村田学術振興財団  第38回（2022年度）研究助成

    川崎慎司

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    Authorship：Principal investigator 

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  • Physics of Spin-triplet superconductivity

    Grant number：19H00657  2019.04 - 2023.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    鄭 国慶, 俣野 和明, 川崎 慎司, 市岡 優典

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    Grant amount：\44590000 （ Direct expense: \34300000 、 Indirect expense：\10290000 ）

    （１）強磁性スピンゆらぎが存在するスピン三重項超伝導体K2Cr3As3の高品質単結晶の作製に成功した。
    （２）K2Cr3As3の関連物質Cs2Cr3As3において、１K以下の低温まで磁化率測定を行い、この物質の本質的な超伝導転移が1.2Kで起こるが、磁場をc軸に平行にかけると、フィラメント的な超伝導が現れることを明らかにした。
    （３）カゴメ構造をもつ超伝導体CsV3Sb5における電荷密度波の構造がダビット星型であることを明らかにした。
    （４）スピン三重項超伝導体CuxBi2Se3において、磁場によってベクトル秩序変数の制御に成功した。スピン三重項超伝導体CuxBi2Se3のベクトル秩序変数の方向が結晶軸からずれることを発見した。また、その理由はフォノンとの結合であることを明らかにした。
    （５）スピン三重項超伝導体CuxBi2Se3の超伝導軌道関数（ギャップ対称性）がpxの対称性を持つことを明らかにした。

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  • Nuclear Magnetic Resonance study of the charge density wave order in the Cu oxide superconductor

    Grant number：19K03747  2019.04 - 2022.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (C)

    Kawasaki Shinji

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    Grant amount：\4290000 （ Direct expense: \3300000 、 Indirect expense：\990000 ）

    We have conducted nuclear magnetic resonance (NMR) experiments to elucidate the origin of the novel charge density wave order in Cu-oxide (cuprate) superconductor, which is the most promising candidate for room-temperature superconductivity among known superconductors. From systematic measurements, we have obtained new findings that indicate the importance of "charge fluctuation" in addition to spin fluctuation, which has been believed to be the origin of high-temperature superconductivity. Based on our results, further developments of physics of the cuprate superconductivity in theoretical and experimental studies focusing on charge fluctuations are expected. Another purpose of the study was to introduce uniaxial strain, a new external parameter that has recently been the focus of much attention in condensed matter physics, into NMR experiments, and we succeeded in developing an laboratory-made piezoelectric uniaxial strain cell during the research period.

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  • 単層型銅酸化物高温超伝導体における電荷密度波・擬ギャップ・超伝導の起源解明

    2018.10 - 2019.09

    住友電工グループ社会貢献基金  2018年度学術・研究助成

    川崎慎司

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    Authorship：Principal investigator 

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Other research activities

  • 高圧ガス製造保安責任者免状

    2008.02

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Class subject in charge

  • Seminar in Low Temperature Condensed Matter Physics （2024academic year） Other  - その他

  • Seminar in Low Temperature Condensed Matter Physics （2024academic year） Year-round  - その他

  • Advanced Seminar in Low Temperature Condensed Matter Physics （2024academic year） Year-round  - その他

  • Solid State Physics 3 （2024academic year） 1st and 2nd semester  - 木1～2

  • Solid State Physics 3A （2024academic year） 1st semester  - 木1～2

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Media Coverage

  • RSKラジオ「技術の森」生出演 TV or radio program

    RSK山陽放送  2024.8

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    Author：Myself 

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  • 岡山大など、銅酸化物での高温超伝導の仕組み解明に近づく発見 Internet

    MITテクノロジーレビュー  2024.6.26

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    Author：Other 

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  • 岡山大、銅酸化物高温超伝導体の結晶をひずませると電荷が現れることを発見 Internet

    マイナビニュース  2024.6.20

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    Author：Other 

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  • 不純物散乱に強い未知の超伝導を新たに発見 Newspaper, magazine

    科学新聞  2020.9.13

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  • 不純物散乱に強い未知の超伝導を新たに発見 Internet

    マイナビニュース  2020.9.3

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