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Emergence and electrochemical control of Josephson effects in microfabricated single crystals of iron chalcogenide superconductors

Research Project

Project/Area Number 18K03547
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 InstitutionAoyama Gakuin University

Principal Investigator

Kitano Haruhisa  青山学院大学, 理工学部, 教授 (00313164)

Co-Investigator(Kenkyū-buntansha) 孫 悦  青山学院大学, 理工学部, 助教 (30824180)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords鉄カルコゲナイド / 対破壊電流密度 / ジョセフソン効果 / スピン軌道相互作用 / 電気化学 / 異方性 / 非平衡 / 多バンド
Outline of Final Research Achievements

Iron chalcogenide superconductors have minimal superconducting units and show various quantum-mechanical phenomena. We investigate the emergence and control of Josephson effects, intrinsic to this system, by using the microfabrication and electrochemical methods applied to high-quality single crystals.
We succeed in measuring the depairing current density, which determines the critical velocity of the superconducting Cooper pairs, by reducing the cross sectional area of narrow bridge devices and preventing the generation of flux quantum. Furthermore, we observe the dynamical enhancement of non-equilibrium Josephson current in the current-biased short bridge devices with the lateral area less than 1 squared micrometer. This suggests a possibility of the electrochemical adjustment of Josephson junction properties.

Academic Significance and Societal Importance of the Research Achievements

従来のジョセフソン効果の研究と応用は、銅酸化物系の固有ジョセフソン効果を除き、超伝導薄膜から作製される素子に限定されてきたが、本研究成果は、高品質単結晶への微細加工と電気化学処理により、ジョセフソン素子が作製できる可能性を示した。また、超伝導輸送電流の理論的限界値を与える対破壊電流密度も、ごく一部の薄膜試料に対する測定に限定されてきたが、本研究成果は高品質な単結晶試料に対して評価できることを実証した。今後、時間反転や空間反転などの対称性が破れた新奇超伝導状態における超伝導電子対の臨界速度を検証するための道が切り拓かれた。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (24 results)

All 2021 2020 2019 2018 Other

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (19 results) (of which Int'l Joint Research: 1 results) Remarks (3 results)

  • [Journal Article] Focused ion beam microfabrication of single-crystal nanobridge toward Fe(Te,Se)-based Josephson device2021

    • Author(s)
      Takamaro Miyazawa, Naoki Tadokoro, Shumpei Horikawa, Tsuyoshi Tamegai, Yue Sun and Haruhisa Kitano
    • Journal Title

      Journal of Physics: Conference Series

      Volume: -

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Achieving the depairing limit along the c axis in Fe1+yTe1-xSex single crystals2020

    • Author(s)
      Sun Yue、Ohnuma Haruka、Ayukawa Shin-ya、Noji Takashi、Koike Yoji、Tamegai Tsuyoshi、Kitano Haruhisa
    • Journal Title

      Physical Review B

      Volume: 101 Issue: 13 Pages: 134516-134516

    • DOI

      10.1103/physrevb.101.134516

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] FIBピックアップ法による鉄カルコゲナイド超伝導体の面間ナノブリッジ素子の作製と電流電圧特性2021

    • Author(s)
      宮沢貴麿, 田所直紀, 為ヶ井強, 孫悦, 北野晴久
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Fe1-x+yCoxTe0.6Se0.4単結晶における過剰鉄除去とCo置換効果2021

    • Author(s)
      深山雄基, 加藤輝, 平祥樹, 堀川舜平, 孫悦, 北野晴久
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Out-of-plane transport property of FeSe single crystal2021

    • Author(s)
      Y. Sun, T. Miyazawa, T. Tamegai, H. Kitano
    • Organizer
      日本物理学会第76回年次大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Fe(Te,Se)単結晶の面内微小ブリッジ素子の作製と対破壊電流密度測定2020

    • Author(s)
      峯直輝, 孫悦, 堀川舜平, 平祥樹, 為ヶ井強, 北野晴久
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Achieving the depairing limit along c-axis in Fe(Te, Se) single crystals2020

    • Author(s)
      Y. Sun, H. Ohnuma, S. Ayukawa, T. Noji, Y. Koike, T. Tamegai, H. Kitano
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Focused ion beam microfabrication of single-crystal nanobridge toward Fe(Te,Se)-based Josephson device2020

    • Author(s)
      T. Miyazawa, N. Tadokoro, T. Tamegai, Y. Sun, H. Kitano
    • Organizer
      The 33rd International Symposium on Superconductivity (ISS2020)
    • Related Report
      2020 Annual Research Report
  • [Presentation] Depairing Jc and its anisotropy of Fe(Te,Se) single crystals2020

    • Author(s)
      Y. Sun, N. Mine, T. Miyazawa, T. Tamegai, H. Kitano
    • Organizer
      The 33rd International Symposium on Superconductivity (ISS2020)
    • Related Report
      2020 Annual Research Report
  • [Presentation] ピックアップ法による鉄カルコゲナイド微小試料の作製と面間微小ブリッジの電流圧特性2020

    • Author(s)
      宮沢貴麿, 田所直紀, 為ヶ井強, 孫悦, 北野晴久
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2019 Research-status Report
  • [Presentation] アニール処理されたFe(Te,Se)単結晶における過剰鉄除去効果と微小ブリッジによる面内臨界電流密度測定2020

    • Author(s)
      峯直輝, 孫悦, 堀川舜平, 平祥樹, 為ヶ井強, 北野晴久
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Achieving the depairing limit of iron chalcogenide superconductors2020

    • Author(s)
      Y. Sun, H. Ohnuma, S. Ayukawa, T. Noji, Y. Koike, T. Tamegai, H. Kitano
    • Organizer
      日本物理学会第75回年次大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Fe(Te,Se)単結晶微小ブリッジに対する電気化学的過剰鉄制御と対破壊電流密度測定2019

    • Author(s)
      峯直輝, 大沼遥, 孫悦, 堀川舜平, 野地尚, 小池洋二, 為ヶ井強, 北野晴久
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Fe(Te,Se)単結晶微小ブリッジを用いた面間ジョセフソン接合素子の作製2019

    • Author(s)
      宮沢貴麿, 堀川舜平, 為ヶ井強, 孫悦, 北野晴久
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Revisiting the annealing effect of Fe1+yTe1-xSex single crystals2019

    • Author(s)
      Sun Yue, Horikawa Shunpei, Kitano Haruhisa, and Tamegai Tsuyoshi
    • Organizer
      日本物理学会2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Interlayer Charge Dynamics of High-Quality Fe(Te,Se) Single Crystals in the Normal and Superconducting States2019

    • Author(s)
      Y. Sun, N. Mine, T. Miyazawa, H. Ohnuma, T. Noji, Y. Koike, T. Tamegai, and H. Kitano
    • Organizer
      International Conference on Strongly Correlated Electron Systems 2019 (SCES2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Achieving the depairing limit along c-axis in Fe1+yTe1-xSex single crystals2019

    • Author(s)
      Y. Sun, H. Ohnuma, S. Ayukawa, T. Noji, Y. Koike, T. Tamegai, H. Kitano
    • Organizer
      第27回渦糸物理ワークショップ
    • Related Report
      2019 Research-status Report
  • [Presentation] Fe(Se,Te)単結晶の面内微小接合素子の作製と電気化学的キャリア制御2019

    • Author(s)
      大沼遥, 岡田一宏, 高木友宏, 野地尚, 小池洋二, 鮎川晋也, 為ヶ井強, 孫悦, 北野晴久
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Superconducting and normal state anisotropy of Fe(Te,Se) single crystals2019

    • Author(s)
      Sun Yue, Ohnuma Haruka, Mine Naoki, Kitano Haruhisa, Tamegai Tsuyoshi
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] FeTexSe1-x単結晶への微細加工素子を用いた対破壊電流密度測定2019

    • Author(s)
      大沼遥,孫悦,峯直輝,野地尚,小池洋二,為ヶ井強, 鮎川晋也, 北野晴久
    • Organizer
      第66回応用物理学会春季学術講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] Fe(Se,Te)単結晶における電気化学的過剰鉄の制御と固有ジョセフソン接合的挙動の研究2018

    • Author(s)
      大沼遥, 岡田一宏, 高木友宏, 野地尚, 小池洋二, 為ヶ井強, 鮎川晋也, 孫悦, 北野晴久
    • Organizer
      日本物理学会2018年秋季大会
    • Related Report
      2018 Research-status Report
  • [Remarks] 青山学院大学理工学部物理科学科・北野研究室

    • URL

      http://www.phys.aoyama.ac.jp/~w3-kitano/index.html

    • Related Report
      2020 Annual Research Report
  • [Remarks] 青山学院大学物理数理学科・北野研究室

    • URL

      http://www.phys.aoyama.ac.jp/~w3-kitano/index.html

    • Related Report
      2019 Research-status Report
  • [Remarks] 青山学院大学理工学部物理・数理学科北野研究室ホームページ

    • URL

      http://www.phys.aoyama.ac.jp/~w3-kitano/index.html

    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2022-01-27  

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