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Theoretical studies to establish experimental methods of determination of gap structures in unconventional superconductors

Research Project

Project/Area Number 17K05553
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Condensed matter physics II
Research InstitutionRitsumeikan University

Principal Investigator

Machida Kazushige  立命館大学, 総合科学技術研究機構, プロジェクト研究員 (50025491)

Project Period (FY) 2017-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords非自明超伝導体 / 超伝導ギャップ構造 / 重い電子系 / 強相関電子系 / 非自明超伝導 / パウリ限界 / 重い電子系超伝導体 / カゴメ金属 / 重い電子系超伝導 / カイラル超伝導 / 水平ラインノード / 超伝導 / ギャップ構造 / 強相関物質 / パウリ常磁性効果 / 強相関系 / スピン3重項超伝導 / 物性理論
Outline of Final Research Achievements

One of the main purposes of this study is to determine the gap structure in non-trivial superconductors, which exhibit unconventional physical properties unseen in conventional superconductors. This study is important in uncovering the pairing mechanism in such materials, which may ultimately lead to novel superconductor with high transition temperature. In this study we take up several unconventional superconductors in order to determine their gap structures. In some of them the gap structures are unambiguously determined by using field rotation specific heat measurement, but there remain undetermined due to sample quality. Namely the heavy Fermion superconductor UTe2, which is one of the focus in condensed matter community and claimed to be a point node gap structure by us must be rechecked by using ultra-high quality samples with Tc=2K. This is an urgent next work.

Academic Significance and Societal Importance of the Research Achievements

当該研究は物性物理学の根底にある自然界が示す自然法則を具体的、個別的な物質に着目して解き明かそうとする試みである。そうした文脈の中で当該研究の達成した成果は確実な基礎の一つを物性分野に加えたと言える。即ち、超伝導ギャップ決定の強力な手段の提供は今後この分野の発展の基盤的な知見を与えたと言える。こうした知見はより広い立場、即ち社会的な観点から見ても直接的な応用は無いにしろ汎用性を有しており、将来にわたって有効なものであり十分に社会的な意義を持っていると言える。

Report

(7 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (19 results)

All 2022 2021 2020 2019 2018 2017 Other

All Int'l Joint Research (1 results) Journal Article (13 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 13 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 3 results)

  • [Int'l Joint Research] Max Planck Institute(ドイツ)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Anomalous electromagnetic response in spin-triplet superconductor UTe22022

    • Author(s)
      Shimizu Yusei、Kittaka Shunichiro、Kono Yohei、Sakakibara Toshiro、Machida Kazushige、Nakamura Ai、Li Dexin、Homma Yoshiya、Sato Yoshiki J.、Miyake Atsushi、Yamashita Minoru、Aoki Dai
    • Journal Title

      Physical Review B

      Volume: 106 Issue: 21 Pages: 2145251-6

    • DOI

      10.1103/physrevb.106.214525

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Violation of Pauli-Clogston limit in the heavy-fermion superconductor CeRh2As2: Duality of itinerant and localized 4 f electrons2022

    • Author(s)
      Kazushige Machida
    • Journal Title

      Phys. Rev. B

      Volume: 106 Issue: 18 Pages: 1845091-8

    • DOI

      10.1103/physrevb.106.184509

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Nonunitary triplet superconductivity tuned by field-controlled magnetization: URhGe, UCoGe, and UTe22021

    • Author(s)
      Kazushige Machida
    • Journal Title

      Phys. Rev. B

      Volume: 104 Issue: 1 Pages: 0145141-21

    • DOI

      10.1103/physrevb.104.014514

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Notes on multiple superconducting phases in UTe2 ---Third transition---2020

    • Author(s)
      Kazushige Machida
    • Journal Title

      J Phys. Soc. Jpn.

      Volume: 89 Issue: 6 Pages: 065001-065001

    • DOI

      10.7566/jpsj.89.065001

    • NAID

      210000158253

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Horizontal Line Nodes in Sr2RuO4 Proved by Spin Resonance2020

    • Author(s)
      Kazuki Iida, et al
    • Journal Title

      J Phys. Soc. Jpn.

      Volume: 89 Issue: 5 Pages: 053702-053702

    • DOI

      10.7566/jpsj.89.053702

    • Related Report
      2020 Research-status Report 2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Theory of Spin-polarized Superconductors -An Analogue of Superfluid He-3 A-phase-2020

    • Author(s)
      K. Machida
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 89 Issue: 3 Pages: 033702-033702

    • DOI

      10.7566/jpsj.89.033702

    • Related Report
      2020 Research-status Report 2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Microscopic Eilenberger theory of Fulde-Ferrell-Larkin-Ovchinnikov states in the presence of vortices2020

    • Author(s)
      Kenta M. Suzuki, et al
    • Journal Title

      Phys. Rev. B

      Volume: B101 Issue: 21 Pages: 214516-214516

    • DOI

      10.1103/physrevb.101.214516

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Quasiparticle Evidence for the Nematic State above Tc in SrxBi2Se32019

    • Author(s)
      Yue Sun, Shunichiro Kittaka, Toshiro Sakakibara, Kazushige Machida, Jinghui Wang, Jinsheng Wen, Xiangzhuo Xing, Zhixiang Shi, and Tsuyoshi Tamegai
    • Journal Title

      Phys. Rev. Lett.

      Volume: 123 Issue: 2 Pages: 027002-027002

    • DOI

      10.1103/physrevlett.123.027002

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Theoretical studies for identifying horizontal line nodes via angle-resolved density-of-states measurements: Application to Sr2RuO42019

    • Author(s)
      Kazushige Machida, Koki Irie, Katsuhiro Suzuki, Hiroaki Ikeda, and Yasumasa Tsutsumi
    • Journal Title

      Pays. Rev. B

      Volume: 99 Issue: 6 Pages: 0645101-14

    • DOI

      10.1103/physrevb.99.064510

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Searching for gap zeros in Sr2RuO4 via field-angle-dependent specific-heat measurement2018

    • Author(s)
      Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Naoki Kikugawa, Taichi Terashima, Shinya Uji, Dmitry A. Sokolov, Andrew P. Mackenzie, Koki Irie, Yasumasa Tsutsumi, Katsuhiro Suzuki, and Kazushige Machida
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 87 Issue: 9 Pages: 0937031-5

    • DOI

      10.7566/jpsj.87.093703

    • NAID

      210000134938

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Spin triplet nematic pairing symmetry and superconducting double transition in U1-xThxBe132018

    • Author(s)
      K. Machida
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 87 Issue: 3 Pages: 0337031-4

    • DOI

      10.7566/jpsj.87.033703

    • NAID

      210000134719

    • Related Report
      2018 Research-status Report 2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Gap structure of FeSe determined by angle-resolved specific heat measurements in applied rotating magnetic field2017

    • Author(s)
      Y. Sun, S. Kittaka, S. Nakamura, T. Sakakibara, K. Irie, T. Nomoto, K. Machida, J. Chen, and T. Tamegai
    • Journal Title

      Phys. Rev. B

      Volume: 96 Issue: 22

    • DOI

      10.1103/physrevb.96.220505

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Quasiparticle excitations and evidence for superconducting double transitions in mono crystalline U0.97Th0.03Be132017

    • Author(s)
      Y. Shimizu, S. Kittaka, S. Nakamura, T. Sakakibara, D. Aoki, Y. Homma, A. Nakamura, and K. Machida
    • Journal Title

      Phys. Rev. B

      Volume: 96 Issue: 10 Pages: 100505-100505

    • DOI

      10.1103/physrevb.96.100505

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] 強磁性超伝導体の理論 超流動3He A相との類似性2020

    • Author(s)
      町田一成
    • Organizer
      日本物理学会秋季大会
    • Related Report
      2020 Research-status Report
    • Invited
  • [Presentation] Theory of ferromagnetic superconductors and its application to UTe2 ---Analogue of superfluid 3He A phase--2020

    • Author(s)
      K. Machida
    • Organizer
      日本物理学会年会
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Spin Singlet Pairing in Sr2RuO4 with Horizontal Nodes--Present Status and Future Prospect--2019

    • Author(s)
      K. Machida
    • Organizer
      Strongly Correlated Electron Systems (SCES) 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Sr2RuO4の対称性の問題--理論的側面--2019

    • Author(s)
      町田一成
    • Organizer
      日本物理学会年会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Sr2RuO4における磁気感受率の超伝導ギャップ依存性の解析2019

    • Author(s)
      鈴木雄大、町田一成、池田浩章
    • Organizer
      日本物理学会年会
    • Related Report
      2018 Research-status Report

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Published: 2017-04-28   Modified: 2024-01-30  

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