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Investigation of spin liquid mechanism and universal phase diagram of pi-d type quasi-two-dimensional organic superconductor

Research Project

Project/Area Number 19K03707
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionHokkaido University

Principal Investigator

Matsunaga Noriaki  北海道大学, 理学研究院, 准教授 (10222308)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsスピン液体 / π-d相互作用 / 擬一次元有機超伝導体 / 擬二次元有機超伝導体
Outline of Research at the Start

本研究の第一の目的は比熱・ゼロ磁場及び磁場中μSR、誘電率、磁化、圧力下の輸送現象測定等を駆使し、正三角格子から大きくずれている二次元三角格子スピン液体を調べることによりピン液体物質の安定化の仕組みを解明すること。第二の目的は、λ型結晶とほぼ同じ結晶構造を持ちながらπ-d相互作用やd-d相互作用が異なるλ'およびλ''型結晶系を研究することにより、π-d系の統一的理解を目指すことである。

Outline of Final Research Achievements

To understand the π-d system, μSR measurement of λ-(STF)2GaCl4 was performed using helium-3, and we found that there was no transition to the antiferromagnetic phase down to 0.5K. We also synthesized new conductors λ'-(STF)2FeBr4 and λ″-(BETS)2FeBr4 and found that these become superconducting states under pressure. Furthermore, we synthesized a new quasi-one-dimensional material (DMET-TTF)2AuBr2 and discovered that it becomes a commensurate spin density wave with a new arrangement at ambient pressure and superconducting state under pressure.
From these studies, it was found that to understand the π-d system, the d-d interaction and the dimensionality of the system are important in addition to the π-d interaction.

Academic Significance and Societal Importance of the Research Achievements

本研究により、二次元三角格子系におけるスピン液体安定化の仕組みの理解が深まるとともに。ほぼ同じ結晶構造を持ちながらπ-d相互作用やd-d相互作用が異なる系の研究により、π-d系の統一的理解が深まった。また、新規超伝導体を発見した。さらに、新規擬一次元物質(DMET-TTF)2AuBr2を合成に成功し、これまでにない並びの整合スピン密度波、圧力下で超伝を発見し、新奇電子状態の発見に寄与した。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (10 results)

All 2021 2020 2019

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (9 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Spin density wave in the strongly dimerized quasi-one-dimensional organic conductor (DMET-TTF)2AuBr22021

    • Author(s)
      Iida Youhei、Sawada Masashi、Sasaki Yoshiaki、Tsuchiya Tomoaki、Minamidate Takaaki、Matsunaga Noriaki、Kawamoto Atsushi、Nomura Kazushige
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 18 Pages: 184409-184409

    • DOI

      10.1103/physrevb.104.184409

    • NAID

      120007179817

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Presentation] Electronic properties of quasi-one-dimensional organic conductor (DMET-TTF)2AuBr22021

    • Author(s)
      T. Kato, Y. Iida, Y. Sasaki, M. Sawada, N. Matsunaga, A. Kawamoto, K. Nomura
    • Organizer
      YOUNG MULTIS - Multiscale Phenomena in Condensed Matter - conference for young researchers
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Investigation of π-d interaction in λ-(BEST)2FeCl42021

    • Author(s)
      R. Saito, Y. Iida, A. Ito, T. Kobayashi, H. Taniguchi, N. Matsunaga, S. Fukuoka, A. Kawamoto
    • Organizer
      YOUNG MULTIS - Multiscale Phenomena in Condensed Matter - conference for young researchers
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] π-d電子系の反強磁性共鳴2021

    • Author(s)
      大島勇吾, Taehoon Lee, Hengbo Cui, 南舘孝亮, 斎藤洋平, 河本充司, 松永悟明, 加藤礼三
    • Organizer
      日本物理学会 第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 擬一次元有機導体(DMET-TTF)2AuBr2 の電子物性IV2021

    • Author(s)
      加藤大賀, 飯田瑶平, 佐々木義明, 土屋智敬, 澤田賢志, 松永悟明, 河本充司, 野村一成
    • Organizer
      日本物理学会 第76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 擬一次元有機導体(DMET-TTF)2AuBr2 の電子物性III2020

    • Author(s)
      飯田瑶平, 佐々木義明, 土屋智敬, 澤田賢志, 松永悟明, 河本充司, 野村一成
    • Organizer
      日本物理学会 2020年秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 擬一次元有機導体(DMET-TTF)2AuBr2 の電子物性(2)2020

    • Author(s)
      飯田瑶平, 佐々木義明, 土屋智敬, 澤田賢志, 松永悟明, 河本充司, 野村一成
    • Organizer
      日本物理学会 第75回年次大会
    • Related Report
      2019 Research-status Report
  • [Presentation] π-d電子系λ-(STF)2FeCl4の電子スピン共鳴2019

    • Author(s)
      大島勇吾, Taehoon Lee, 南舘孝亮, 斎藤洋平, 河本充司, 松永悟明, 加藤礼三
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] π-d系有機導体λ’-(BEDT-STF)2FeBr4の磁性における微視的描像2019

    • Author(s)
      南舘孝亮, 大島勇吾, 和田大阿, 松永悟明, 野村一成, 加藤礼三
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 擬一次元有機導体(DMET-TTF)2AuBr2 の電子物性2019

    • Author(s)
      佐々木義明, 土屋智敬, 澤田賢志, 松永悟明, 河本充司, 野村一成
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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