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Exotic phenomena in unconventional superconductors: The role of the spin-orbit coupling and chirality of the Cooper pair

Research Project

Project/Area Number 20K03826
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 InstitutionHirosaki University

Principal Investigator

Goryo Jun  弘前大学, 理工学研究科, 教授 (70365013)

Co-Investigator(Kenkyū-buntansha) 植木 輝  北海道大学, 理学研究院, 研究院研究員 (90828469)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
KeywordsSuperconductivity / Topology / Spin-orbit interaction / カイラル超伝導 / 対称性 / トポロジー / スピン軌道相互作用 / 多バンド構造 / スピンホール金属 / 強相関電子系 / カイラルエッジ状態 / 境界状態 / 超伝導スピントロニクス / 時間反転対称性の破れ
Outline of Research at the Start

多バンド構造やスピン軌道相互作用が存在する金属系では、スピンホール効果など多彩なスピントロニクスが展開されている。そのような金属系の超伝導ではさらに豊富な現象が生じ、超伝導スピントロニクスやトポロジカル超伝導など興味深い提案が数多くなされているが、未だ開拓の余地が大いにある。本研究では蜂の巣ネットワーク系超伝導体 SrPtAs に注目する。この超伝導体では時間反転対称性を破るトポロジカルなカイラルd-波状態が実現している可能性が高い。我々はスピン軌道相互作用とカイラル状態の協奏により何が起こり得るか詳細に検討し、トポロジー的性質を活用した超伝導スピントロニクスの新たな展開を目指す。

Outline of Final Research Achievements

In this study, we focus on the honeycomb network superconductors SrPtAs and investigate the non-trivial superconducting phenomena induced by spin-orbit interaction. Specifically, we pursue the possibility that the superconductivity in SrPtAs realizes a topological chiral d-wave pairing symmetry that breaks time-reversal symmetry. We thoroughly examine the interplay between spin-orbit interaction and chiral pairing, revealing that spontaneous magnetization can occur at the sample boundaries. This phenomenon is shown to be a universal property, occurring not only in SrPtAs but also in chiral superconducting states of spin-Hall metals, as demonstrated using another general model.

Academic Significance and Societal Importance of the Research Achievements

超伝導と磁性は元来相反するものと考えられてきた. しかし, 強磁性超伝導体など磁性と超伝導が共存する場合も存在し得ることが, 強相関電子系の超伝導に関する議論が発展するにつれ明らかになってきた.この問題は, クーパー対のトポロジー的性質とスピン軌道相互作用の協奏により自発磁化が発生するというものであり, 磁性の起源として新しいものである. 超伝導スピントロニクスに新たな知見を用いることとなり, 新たなデバイス開発への足掛かりともなり得る.

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (15 results)

All 2023 2022 2021 2020

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 4 results) Presentation (8 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Pairing Symmetry in the Ordered Honeycomb Network Superconductor BaPtAs2023

    • Author(s)
      Tsuyoshi Imazu, Masafumi Kudo, Shohei O. Singu, Jun Goryo, Yoshiki Imai
    • Journal Title

      New Phys.: Sae Mulli

      Volume: 73 Pages: 1110-1114

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Study on Susceptibilities of Superconductors BaPtSb and BaPtAs with Honeycomb Structure2023

    • Author(s)
      Naoya Furutani, Yoshiki Imai, Tsuyoshi Imazu, and Jun Goryo
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 92 Pages: 094708-094708

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Non-monotonic Variation of Superconducting Transition Temperature in BaPtAs-BaPtSb Solid Solution2022

    • Author(s)
      Taiki Ogawa1,2, Kaoru Manabe1, Tetsuya Takeuchi3 , Takanori Kida4 , Haruhiko Kuroe5 , Masayuki Hagiwara4 , Jun Goryo6 , Tadashi Adachi5 , and Kazutaka Kudo1,
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 91 Issue: 12 Pages: 1-4

    • DOI

      10.7566/jpsj.91.123702

    • Related Report
      2022 Research-status Report
    • Peer Reviewed
  • [Journal Article] Tobological feedback for superconducting states2022

    • Author(s)
      Yutaka Tobita and Jun Goryo
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 2164 Pages: 012010-012010

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Electronic structures and effective models in BaPtSb and BaPtAs with ordered honeycomb structures2022

    • Author(s)
      Yoshiki Imai, Tsuyoshi Imazu and Jun Goryo
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 2164 Pages: 012011-012011

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Possible pairing symmetries in the ordered honeycomb network superconductor BaPtSb2022

    • Author(s)
      Masafumi Kudo, Shohei O. Shingu, Tsuyoshi Imazu, Jun Goryo and Yoshiki Imai
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 2164 Pages: 012015-012015

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spontaneous spin polarization at the edge of the chiral superconducting states in a spin Hall metal2022

    • Author(s)
      Tsuyoshi Imazu and Jun Goryo
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 2164 Pages: 012016-012016

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Tobological feedback for superconducting states2021

    • Author(s)
      Yutaka Tobita and Jun Goryo
    • Organizer
      Strongly Correlated Electron Systems (SCES) 2020
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Electronic structures and effective models in BaPtSb and BaPtAs with ordered honeycomb structures2021

    • Author(s)
      Yoshiki Imai, Tsuyoshi Imazu and Jun Goryo
    • Organizer
      Strongly Correlated Electron Systems (SCES) 2020
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Possible pairing symmetries in the ordered honeycomb network superconductor BaPtSb2021

    • Author(s)
      Masafumi Kudo, Shohei O. Shingu, Tsuyoshi Imazu, Jun Goryo and Yoshiki Imai
    • Organizer
      Strongly Correlated Electron Systems (SCES) 2020
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spontaneous spin polarization at the edge of the chiral superconducting states in a spin Hall metal2021

    • Author(s)
      Tsuyoshi Imazu and Jun Goryo
    • Organizer
      Strongly Correlated Electron Systems (SCES) 2020
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] BHZ金属におけるカイラルp-波超伝導のエッジ状態2021

    • Author(s)
      今津毅士, 御領潤
    • Organizer
      日本物理学会大76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 空間反転対称性を破る物質 BaPtSb における超伝導ペアリング対称性2021

    • Author(s)
      工藤成史, 大場翔平, 御領潤
    • Organizer
      日本物理学会大76回年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 非共型結晶系におけるバンド縮退とインターバンド・ペアリング状態2020

    • Author(s)
      大場翔平, 植木輝, 御領潤
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 空間反転対称性を破る超伝導体BaPtSb/BaPsAsのペアリング対称性の分類2020

    • Author(s)
      工藤成史, 大場翔平, 御領潤
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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