Coexistence of magnetic order and superconductivity in iron-based superconductor studied by nuclear resonant small-angle scattering and Mossbauer Spectroscopy under magnetic fields

• Project/Area Number: 16K05446
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Condensed matter physics II
• Research Institution: Kyoto University
• Principal Investigator: Kitao Shinji 京都大学, 複合原子力科学研究所, 准教授 (00314295)
• Project Period (FY): 2016-04-01 – 2020-03-31
• Project Status: Completed (Fiscal Year 2019)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2018: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000); Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2016: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
• Keywords: 鉄系超伝導 / メスバウアー分光 / 小角散乱 / 微細組織 / 磁気秩序 / 核共鳴小角散乱 / 鉄系超伝導体 / 磁気的微細組織 / メスバウアー効果 / 核共鳴散乱 / 物性実験 / 超伝導材料 / Ｘ線 / 磁性 / 低温物性

Outline of Final Research Achievements

Coexistence of magnetic order and superconductivity in iron-based superconductor was studied by nuclear resonant small-angle scattering and Mossbauer Spectroscopy.Some iron-based superconductors have coexistence region in their phase diagram.The nuclear resonant small-angle scattering is newly-developed method suitable for the investigation of microstructure with magnetic states. The results suggested the coexistence state has complicated microstructure without specific size in the regions of a few to few tens of nanometers.

Academic Significance and Societal Importance of the Research Achievements

新たに開発した核共鳴小角散乱の手法を用いて、一部の鉄系超伝導体の相図の一部の領域において生じている磁気秩序と超伝導の共存状態について、その描像を明らかにすることができた。これにより鉄系超伝導体のメカニズムの解明に向けた研究が進展がすると期待できる。また、核共鳴小角散乱は磁気状態の微細組織の研究に応用できることが実証され、これまでに研究が難しかった磁気状態の微細組織のさまざま研究への波及した展開が期待できる。

Research Products

• [Journal Article] 125Te-Mossbauer study of Fe1.1Te and FeTe0.5Se0.5 superconductor (2019)
  • Author(s): Shinji Kitao, Masayuki Kurokuzu, Yasuhiro Kobayashi, Makoto Seto
  • Journal Title: Hyperfine Interact. Volume: 240 Issue: 1 Pages: 112-112
  • DOI: 10.1007/s10751-019-1652-1
  • Peer Reviewed
• [Journal Article] Nuclear Resonant Small-Angle Scattering for Investigation of Microstructures in Electronic States (2019)
  • Author(s): S. Kitao, M. Kurokuzu, Y. Kobayashi, M. Seto, Y. Yoda, and S. Kishimoto
  • Journal Title: AIP Conf. Proc. Volume: 2054 Pages: 050013-050013
  • DOI: 10.1063/1.5084631
  • NAID: 130008147609
  • Peer Reviewed / Open Access
• [Presentation] 核共鳴小角散乱によるFe-Ni-Cの磁気的微細組織の観測 (2020)
  • Author(s): 北尾真司, 小林康浩, 黒葛真行, 瀬戸誠, 依田芳卓, 岸本俊二
  • Organizer: 日本物理学会 第75回年次大会（web公開による開催）
• [Presentation] 125Te-Mossbauer Study of Fe1.1Te and FeTe0.5Se0.5 Superconductor (2019)
  • Author(s): S. Kitao, M. Kurokuzu, Y. Kobayashi, and M. Seto
  • Organizer: Mediterranean Conference on the Applications of the Mossbauer Effect (MECAME2019), Montpellier, France
  • Int'l Joint Research
• [Presentation] Magnetic Microstructures in Fe-Ni-C Alloy Studied by Nuclear Resonant Small-Angle Scattering (2019)
  • Author(s): S. Kitao, Y. Kobayashi, M. Kurokuzu, M. Seto, Y. Yoda, and S. Kishimoto
  • Organizer: International Conference on the Applications of the Mossbauer Effect(ICAME2019), Dalian, China
  • Int'l Joint Research
• [Presentation] Nuclear Resonant Small-Angle Scattering for Investigation of Microstructures in Electronic States (2018)
  • Author(s): S. Kitao, M. Kurokuzu, Y. Kobayashi, M. Seto, Y. Yoda, and S. Kishimoto
  • Organizer: The 13th International Conference on Synchrotron Radiation Instumentation (SRI2018)
  • Int'l Joint Research
• [Presentation] 核共鳴小角散乱による電子状態の微細構造観測手法の開発 (2018)
  • Author(s): 北尾真司，黒葛真行，小林康浩，瀬戸誠，依田芳卓，岸本俊二
  • Organizer: 日本物理学会 第74回年次大会
• [Presentation] Coexsistence of Superconductivity and Magnetic Order in Under-Doped Fe-Based Superconductor Ba0.8K0.2Fe2As2 Studied by Nuclear Resonant Small-Angle Scattering (2017)
  • Author(s): S. Kitao, M. Kurokuzu, Y. Kobayashi, M. Seto, Y. Yoda, and S. Kishimoto
  • Organizer: The International Conference on the Applications of the Mossbauer Effect
  • Int'l Joint Research
• [Presentation] 核共鳴小角散乱によるアンダードープ鉄系超伝導体Ba0.8K0.2Fe2As2の磁気秩序と超伝導の共存 (2017)
  • Author(s): 北尾真司，黒葛真行，小林康浩，瀬戸誠，依田芳卓，岸本俊二
  • Organizer: 日本物理学会2017年秋季大会
• [Presentation] Ba1-xKxFe2As2のネマティック秩序相の強磁場下メスバウアー分光 (2016)
  • Author(s): 北尾真司，黒葛真行，小林康浩，瀬戸誠
  • Organizer: 日本物理学会 2016年秋季大会
  • Place of Presentation: 金沢大学
  • Year and Date: 2016-09-13