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Microscopic investigation of exotic superconducting state in the higher order multipole state

Research Project

Project/Area Number 16K17757
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics II
Research InstitutionJapan Atomic Energy Agency

Principal Investigator

Hattori Taisuke  国立研究開発法人日本原子力研究開発機構, 原子力科学研究部門 原子力科学研究所 先端基礎研究センター, 研究職 (80757667)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsアクチナイド化合物 / 超伝導対称性 / ナイトシフト / イジング異方性 / スピン一重項超伝導 / 核磁気共鳴法 / ウラン化合物 / NMRナイトシフト / 非従来型超伝導 / 物性実験 / 強相関電子系 / 低温物性 / 超伝導 / 核磁気共鳴
Outline of Final Research Achievements

In order to identify the spin contribution to superconducting pairing compatible with the so-called "hidden order", 29Si nuclear magnetic resonance measurements have been performed using a high-quality single crystal of URu2Si2.
A clear reduction of the 29Si Knight shift in the superconducting state has been observed under a magnetic field applied along the crystalline c axis, corresponding to the magnetic easy axis. These results provide direct evidence for the formation of spin-singlet Cooper pairs.
Consequently, results indicating a very tiny change of the in-plane Knight shift demonstrate extreme uniaxial anisotropy for the spin susceptibility in the hidden order state.

Academic Significance and Societal Importance of the Research Achievements

非従来型の超伝導の詳細を明らかにした本研究成果は、超伝導現象の理解を深め、その発現機構解明の一助となる。
また、磁化困難軸方向に対する地場に対して非常に強い性質の原因を解明したため、今後、磁場に強いより実用的な超伝導体を探索する際に指針を与えるものと期待される。
最後に、電子スピンが一方向のみに固定され、横方向には倒れないという新しい状態は、非常に多くの電子を持つウランが起源となって現れる新しい状態と考えられる。多電子系であることに起因するウラン電子の新しい状態の研究を進めることで基礎物性物理学の進展、原子力基礎科学の充実に寄与するものと思われる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (11 results)

All 2018 2017 2016 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Acknowledgement Compliant: 1 results) Presentation (8 results) (of which Int'l Joint Research: 2 results,  Invited: 2 results) Remarks (1 results)

  • [Journal Article] Evidence for Spin Singlet Pairing with Strong Uniaxial Anisotropy in URu2Si2 Using Nuclear Magnetic Resonance2018

    • Author(s)
      Hattori T.、Sakai H.、Tokunaga Y.、Kambe S.、Matsuda T.?D.、Haga Y.
    • Journal Title

      Physical Review Letters

      Volume: 120 Issue: 2 Pages: 027001-027001

    • DOI

      10.1103/physrevlett.120.027001

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] No Detectable Change in In-Plane 29Si Knight Shift in the Superconducting state of URu2Si22016

    • Author(s)
      T. Hattori, H. Sakai, Y. Tokunaga, S. Kambe, T.D. Matsuda, and Y. Haga
    • Journal Title

      J. Phys. Soc. Jpn

      Volume: 85 Issue: 7 Pages: 073711-073711

    • DOI

      10.7566/jpsj.85.073711

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Strong Ising anisotropy of URu2Si2 probed by 29Si NMR on the Superconducting state2018

    • Author(s)
      T. Hattori, H. Sakai, Y. Tokunaga, S. Kambe, T. D. Matsuda and Y. Haga
    • Organizer
      J-Physics 2018: International Workshop on New Materials and Crystal Growth
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 希釈冷凍機を用いた単結晶URu2Si2の29Si NMR測定2018

    • Author(s)
      服部泰佑、酒井宏典、徳永陽、神戸振作、松田達磨、芳賀芳範
    • Organizer
      1.日本物理学会 2018年年次大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Spin state of superconducting URu2Si2 probed by 29Si Knight shift2017

    • Author(s)
      T. Hattori, H. Sakai, Y. Tokunaga, S. Kambe, T. D. Matsuda, and Y. Haga
    • Organizer
      International Conference on Strongly Correlated Electron Systems 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Strong Ising anisotropy of URu2Si2 probed by 29Si NMR on superconducting state2017

    • Author(s)
      T. Hattori
    • Organizer
      Physics of Uranium based Unconventional Superconductors
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] URu2Si2の超伝導状態におけるスピン磁化率の異方的振る舞い2017

    • Author(s)
      服部 泰佑
    • Organizer
      1.超伝導研究の最先端:多自由度、非平衡、電子相関、トポロジー、人工制御
    • Related Report
      2017 Research-status Report
  • [Presentation] URu2Si2におけるスピン磁化率の強い一軸異方性2017

    • Author(s)
      服部泰佑、酒井宏典、徳永陽、神戸振作、松田達磨、芳賀芳範
    • Organizer
      日本物理学会 2017年年次大会
    • Place of Presentation
      大阪大学豊中キャンパス(大阪府豊中市)
    • Related Report
      2016 Research-status Report
  • [Presentation] 単結晶URu2Si2における超伝導状態の29Siナイトシフト測定2016

    • Author(s)
      服部泰佑、酒井宏典、徳永陽、神戸振作、松田達磨、芳賀芳範
    • Organizer
      日本物理学会 2016年秋季大会
    • Place of Presentation
      金沢大学(石川県金沢市)
    • Related Report
      2016 Research-status Report
  • [Presentation] 29Si Knight Shift in the superconducting state of single crystalline URu2Si22016

    • Author(s)
      服部 泰佑
    • Organizer
      TMU シンポジウム, U系およびBiS2系の物理の最近の発展
    • Place of Presentation
      首都大学東京大沢キャンパス(東京都八王子市)
    • Related Report
      2016 Research-status Report
    • Invited
  • [Remarks] 磁場に負けない超伝導 -ウラン化合物で現れる、磁場に強い超伝導の仕組みを解明-

    • URL

      https://www.jaea.go.jp/02/press2017/p18011301/

    • Related Report
      2017 Research-status Report

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Published: 2016-04-21   Modified: 2020-03-30  

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