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Physical properties and upper critical field of noncentrosymmetric superconductors

Research Project

Project/Area Number 16K06712
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Physical properties of metals/Metal-base materials
Research InstitutionNational Institute for Materials Science

Principal Investigator

ISOBE Masaaki  国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, グループリーダー (10354309)

Co-Investigator(Kenkyū-buntansha) 新井 正男  国立研究開発法人物質・材料研究機構, 技術開発・共用部門, ステーション長 (40222723)
Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords超伝導 / 強相関電子系 / 空間反転対称性 / 電子構造 / 磁性
Outline of Final Research Achievements

Noncentrosymmetric superconductivity refers to the superconductivity that occurs in an asymmetric system which has no inversion center in structure. It has been theoretically predicted that in such a system, odd parity component is mixed in the Cooper pair wave function, and the upper critical magnetic field may become huge. In order to clarify the mechanism of noncentrosymmetric superconductivity, we studied the superconducting state in the new superconductor SrAuSi3. As a result, it was found that SrAuSi3 is a BCS-type weak coupling superconductor. Furthermore, we conducted new material search based on knowledge obtained from the electronic structure in SrAuSi3. We succeeded in discovering a new type of noncentrosymmetric superconductor BaIrSi2.

Academic Significance and Societal Importance of the Research Achievements

超伝導のより広い社会利用を実現するには、転移温度(Tc)・上部臨界磁場(Hc2)・臨界電流(Jc)のブレークスルー的な改善が欠かせない。そのためには、単なる既存物質の材料化では不十分であり、いわゆる“異常金属”と呼ばれる物質を取り上げ、その電子論に立ち返った超伝導発現メカニズムの解明に関する研究が必要である。様々なアプローチがある中、本研究課題では、“空間反転対称性の破れた超伝導”に着目し、その物性解明と新物質開発に取り組んだ。このような基礎研究を多く積み上げることで、将来的に、従来物質の性能を大幅に凌駕する新しい超伝導物質の発見に繋がると考える。

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (11 results)

All 2019 2018 2017 2016 Other

All Journal Article (4 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 4 results,  Acknowledgement Compliant: 1 results) Presentation (4 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results) Remarks (2 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Superconductivity in BaIrSi2: A 5d electron system with a noncentrosymmetric crystal structure2019

    • Author(s)
      Masaaki Isobe, Koji Kimoto, Masao Arai, and Eiji Takayama-Muromachi
    • Journal Title

      Physical Review B

      Volume: 99 Issue: 5

    • DOI

      10.1103/physrevb.99.054514

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Microscopic investigation of the weakly correlated noncentrosymmetric superconductor SrAuSi32018

    • Author(s)
      N. Barbero, P. K. Biswas, M. Isobe, A. Amato, E. Morenzoni, A. D. Hillier, H.-R. Ott, J. Mesot, and T. Shiroka
    • Journal Title

      Physical review B

      Volume: 97 Issue: 2

    • DOI

      10.1103/physrevb.97.024501

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Superconductivity in noncentrosymmetric Ag2Pd3S2017

    • Author(s)
      H. Yoshida, H. Okabe, Y. Matsushita, M. Isobe, and E. Takayama-Muromachi
    • Journal Title

      Physical review B

      Volume: 95 Issue: 18

    • DOI

      10.1103/physrevb.95.184514

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Superconductivity in noncentrosymmetric SrAuSi32016

    • Author(s)
      Masaaki Isobe, Masao Arai, and Naoki Shirakawa
    • Journal Title

      Physical Review B

      Volume: 93 Issue: 5

    • DOI

      10.1103/physrevb.93.054519

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] 空間反転対称性の破れた新型結晶構造を有する5d電子系新超伝導体BaIrSi22019

    • Author(s)
      磯部雅朗、木本浩司、新井正男、室町英治
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] BaIrSi2: A 5d Electron System Superconductor with a New Type of Noncentrosymmetric Crystal Structure2019

    • Author(s)
      Masaaki ISOBE, Koji KIMOTO, Masao ARAI, and Eiji TAKAYAMA-MUROMACHI
    • Organizer
      International Conference on Strongly Correlated Electron Systems 2019 (SCES 2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ca-Pd-Si三元系化合物の超伝導2017

    • Author(s)
      磯部雅朗、木本浩司
    • Organizer
      日本物理学会第72回年次大会
    • Place of Presentation
      大阪大学豊中キャンパス、大阪府豊中市
    • Year and Date
      2017-03-17
    • Related Report
      2016 Research-status Report
  • [Presentation] Superconductivity in Noncentrosymmetric Transition-Metal Compounds2017

    • Author(s)
      M. Isobe
    • Organizer
      EMN Bali Meeting
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] 物質・材料研究機構・機能性材料研究拠点・強相関物質グループ

    • URL

      http://www.nims.go.jp/research/group/strong-correlated-materials/

    • Related Report
      2019 Annual Research Report
  • [Remarks] 物質・材料研究機構・機能性材料研究拠点・強相関物質グループホームページ

    • URL

      http://www.nims.go.jp/research/group/strong-correlated-materials/

    • Related Report
      2018 Research-status Report 2017 Research-status Report
  • [Patent(Industrial Property Rights)] 金属間化合物材料、その製造方法、および、それを用いた超伝導体材料2018

    • Inventor(s)
      磯部雅朗
    • Industrial Property Rights Holder
      国立研究開発法人物質・材料研究機構
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2018-137317
    • Filing Date
      2018
    • Related Report
      2018 Research-status Report

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Published: 2016-04-21   Modified: 2021-02-19  

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