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Determination of Fermi surfaces of the mixed-parity superconductor by quantum oscillation measurement under high pressure

Research Project

Project/Area Number 17H07349
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Condensed matter physics II
Research InstitutionNational Institute for Materials Science

Principal Investigator

HIROSE Hishiro  国立研究開発法人物質・材料研究機構, 機能性材料研究拠点, NIMSポスドク研究員 (40804076)

Project Period (FY) 2017-08-25 – 2019-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsパイロクロア酸化物 / 超伝導 / 量子振動 / 電子状態 / 強相関電子系 / 圧力下測定 / 高圧測定
Outline of Final Research Achievements

The pyrochlore oxide Cd2Re2O7 is considered as a candidate for a mixed-parity superconductor. It is believed that Cd2Re2O7 has an electronic instability due to the strong spin-orbit coupling. The relationship between this instability and superconductivity was of great interest. Thus, it is necessary to elucidate the details of its electronic state. By combining measurements of quantum oscillations and first-principles calculations, we have succeeded in elucidating the details of the electronic state at base temperature.

Academic Significance and Societal Importance of the Research Achievements

パイロクロア酸化物Cd2Re2O7は常圧では室温の立方晶から低温の正方晶へ2回の構造相転移を示す。この構造相転移における原子位置の変化は非常に小さく、これまで精密に決定することができていなかった。今回の研究で、電子状態を量子振動によって直接観測し、第一原理計算を用いて観測された電子状態を再現する原子位置を同定することができた。得られた電子状態や原子位置の情報を用いれば、特異な構造相転移の起源や超伝導の性質などについて、電子状態に根ざした議論を行うことが可能になる。そのため、本研究の成果は、Cd2Re2O7におけるこれらの物性を解明するために大きく資するものである。

Report

(3 results)
  • 2019 Final Research Report ( PDF )
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • Research Products

    (5 results)

All 2020 2019 2018

All Journal Article (2 results) (of which Peer Reviewed: 2 results) Presentation (3 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Real spin and pseudospin topologies in the noncentrosymmetric topological nodal-line semimetal CaAgAs2020

    • Author(s)
      Hishiro T. Hirose, Taichi Terashima, Taichi Wada, Yoshitaka Matsushita, Yoshihiko Okamoto, Koshi Takenaka, Shinya Uji
    • Journal Title

      Physical Review B

      Volume: -

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Split Fermi Surface of the Spin Orbit Coupled Metal Cd2Re2O7 Probed by de Haas-van Alphen Effect2018

    • Author(s)
      Yasuhito Matsubayashi, Kaori Sugii, Hishiro T. Hirose, Daigorou Hirai, Shiori Sugiura, Taichi Terachima, Shinya Uji, Zenji Hiroi
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 87 Issue: 5 Pages: 053702-053702

    • DOI

      10.7566/jpsj.87.053702

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed
  • [Presentation] Inversion-breaking structural distortion driven by strong spin-orbit coupling in Cd2Re2O72019

    • Author(s)
      Hishiro T. Hirose, Taichi Terashima, Daigorou Hirai, Yasuhito Matsubayashi, Naoki Kikugawa, David Graf, Kaori Sugii, Shiori Sugiura, Zenji Hiroi, Shinya Uji
    • Organizer
      Spectroscopies in Novel Superconductors 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] スピン軌道結合金属Cd2Re2O7のスピン分裂したフェルミ面における大きなサイズの違い2019

    • Author(s)
      廣瀬 陽代, 寺嶋 太一, 平井 大悟郎, 松林 康仁, 菊川 直樹, David Graf, 杉井 かおり, 杉浦 栞理, 広井 善二, 宇治 進也
    • Organizer
      日本物理学会
    • Related Report
      2017 Annual Research Report
  • [Presentation] Inversion-breaking structural distortion driven by strong spin-orbit coupling in Cd2Re2O72019

    • Author(s)
      Hishiro T. Hirose, Taichi Terashima, Daigorou Hirai, Yasuhito Matsubayashi, Naoki Kikugawa, David Graf, Kaori Sugii, Shiori Sugiura, Zenji Hiroi, and Shinya Uj
    • Organizer
      Spectroscopies in Novel Superconductors 2019
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research

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Published: 2017-08-25   Modified: 2021-02-19  

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