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Study of pressure-induced topological transition and superconductivity in Type-II Dirac semimetal PdTe2

Research Project

Project/Area Number 20H01851
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
Research InstitutionNiigata University

Principal Investigator

Ohmura Ayako  新潟大学, 自然科学系, 准教授 (60425569)

Co-Investigator(Kenkyū-buntansha) 名嘉 節  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, 主席研究員 (30344089)
石川 文洋  新潟大学, 自然科学系, 准教授 (50377181)
Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2023: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2022: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2021: ¥7,410,000 (Direct Cost: ¥5,700,000、Indirect Cost: ¥1,710,000)
Fiscal Year 2020: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
Keywords超伝導物性 / 高圧物性 / トポロジカル量子物質 / 低温・高圧物性 / 結晶構造解析 / 輸送特性評価 / 低温高圧
Outline of Research at the Start

本研究の概要は、非自明な表面状態をもつタイプII型ディラック半金属PdTe2における圧力誘起トポロジカル相転移(電子状態の変化)とそれに伴って超伝導状態がどのように変化するか、その特性との関係を実験的に解明することである。さらに、申請者らの実験研究よって、PdTe2の表面超伝導は磁場下で異常な振る舞いを示し、それは従来の表面超伝導の理論では説明できないことを見出している。本研究では、この起源を解明してPdTe2のトポロジカル超伝導の可能性も検証したいと考えている。

Outline of Final Research Achievements

We investigated the effect of pressure on the superconductivity of the type-II Dirac semimetal PdTe2 from the viewpoints of both physical properties and crystal structure. The pressure dependence of the superconducting transition temperature (Tc) decreases monotonically from 1 GPa to 6 GPa and has no change related to the theoretically predicted topological phase transition around 5 GPa. We also clarified that the Tc maximum at 1 GPa is not attributed to the pressure variation of carrier density but depends on that of the Debye temperature (lattice stiffness). We also investigated the pressure effect of AuxPd1-xTe2 superconductors, in which Pd sites are substituted with Au, for three compositions. Our results suggest that the pressure dependence of Tc depends on the Debye temperature, which is similar to PdTe2.

Academic Significance and Societal Importance of the Research Achievements

本課題研究の対象物質PdTe2は非自明な表面状態と超伝導状態を併せもつ。その点がトポロジカル超伝導の候補物質として注目される所以であり,本物質の超伝導物性に関する知見は当該分野に対し有益な情報となり得る。また,高圧力の利用は超伝導物性研究の分野でも用いられているが,本研究においてもその有効性を示すことができた。また,申請者の特徴は特に構造的な観点も重視して物性の理解に努める点であり,本課題はその利点がよく表れた成果といえる。

Report

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

    (20 results)

All 2024 2023 2022 2021 2020 Other

All Int'l Joint Research (4 results) Journal Article (5 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (11 results) (of which Int'l Joint Research: 4 results,  Invited: 3 results)

  • [Int'l Joint Research] アムステルダム大学(オランダ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] アムステルダム大学(オランダ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] The University of Amsterdam(オランダ)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] University of Amsterdam(オランダ)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Valence Transitions in Yb1+xIn1-xCu4 Studied by High-resolution X-ray Absorption Spectroscopy, X-ray Diffraction, and Photoelectron Spectroscopy2022

    • Author(s)
      Hitoshi Yamaoka, Shunsuke Yamanaka, Ayako Ohmura, Naohito Tsujii, Jaroslav Valenta, Yusaku Furue, Hitoshi Sato, Hirofumi Ishii, Nozomu Hiraoka, Chishiro Michioka, Hiroaki Ueda, and Kazuyoshi Yoshimura
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 91 Issue: 12 Pages: 124701-124701

    • DOI

      10.7566/jpsj.91.124701

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Phase Transition in Fluid Hydrogen at Room Temperature2022

    • Author(s)
      Nakayama Atsuko、Isurugi Yuya、Serizawa Yuya、Nakano Satoshi、Ohmura Ayako、Ishikawa Fumihiro
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 91 Issue: 9

    • DOI

      10.7566/jpsj.91.093601

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Superconducting and structural properties of the type-I superconductor PdTe2 under high pressure2021

    • Author(s)
      Furue Yusaku、Fujino Tadachika、Salis Marc V.、Leng Huaqian、Ishikawa Fumihiro、Naka Takashi、Nakano Satoshi、Huang Yingkai、de Visser Anne、Ohmura Ayako
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 14 Pages: 144510-144510

    • DOI

      10.1103/physrevb.104.144510

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Cluster glass transition and relaxation in the random spinel CoGa2O42021

    • Author(s)
      T.Naka, T.Nakane, S.Ishii, M.Nakayama, A.Ohmura, F.Ishikawa, A.de Visser, H. Abe, T. Uchikoshi
    • Journal Title

      Physical Review B

      Volume: 103 Issue: 22 Pages: 224408-1

    • DOI

      10.1103/physrevb.103.224408

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Study of Topological Quantum Materials under High-Pressure2020

    • Author(s)
      OHMURA Ayako
    • Journal Title

      The Review of High Pressure Science and Technology

      Volume: 30 Issue: 4 Pages: 281-289

    • DOI

      10.4131/jshpreview.30.281

    • NAID

      130008028888

    • ISSN
      0917-639X, 1348-1940
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Yb-Cu二元金属間化合物YbCux系における圧力誘起の大きな価数転移2024

    • Author(s)
      大村彩子, 山岡人志, 辻井直人, 石井啓文, 平岡 望, 佐藤 仁, 沢田正博
    • Organizer
      日本物理学会2024年春季大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] The effect of pressure on superconductivity in PdTe2 and AuxPd1-xTe22023

    • Author(s)
      Kyohei Tanaka, Tomoyasu Yanagi, Keita Hashimoto, Takashi Naka, Fumihiro Ishikawa, Takayuki Nakane, Motoharu Imai, Satoshi Nakano, Anne de Visser, Ayako Ohmura
    • Organizer
      The Joint 28th AIRAPT and 60th EHPRG International Conference on High Pressure Science and Technology
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] AuxPd1-xTe2超伝導体への圧力効果2023

    • Author(s)
      大村彩子,田中恭平,柳友康,橋本慶太,名嘉節,石川文洋, 中根茂行,今井基晴,中野智志,Anne de Visser
    • Organizer
      第64回高圧討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 酸素雰囲気下で焼成された Pr2Ba4Cu7O15-δの伝導性に対する圧力効果と 酸素欠損状態の相関性2023

    • Author(s)
      佐藤涼介,武田祐汰,村岡智幸,大村彩子,石川文洋
    • Organizer
      第64回高圧討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Structural and superconducting properties of PdTe2 under high pressure2022

    • Author(s)
      Ayako Ohmura, Yusaku Furue, Tadachika Fujino, Kyohei Tanaka, Marc V. Salis, Huaqian Leng, Fumihiro Ishikawa, Takashi Naka, Satoshi Nakano, Yingkai Huang, and Anne de Visser
    • Organizer
      International Conference on Strongly Correlated Electron Systems
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] AuドープPdTe2における超伝導転移の圧力依存性2022

    • Author(s)
      田中恭平, 名嘉節, 石川文洋, 中根茂行, 今井基晴, Anne de Visser, 大村彩子
    • Organizer
      第63回高圧討論会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Pressure-induced Yb-valence change in YbInCu4-Based Compounds2022

    • Author(s)
      Ayako Ohmura, Hitoshi Yamaoka, Naohito Tsujii, Yusaku Furue, Hirofumi Ishii, Liao Yen-Fa, Nozomu Hiraoka
    • Organizer
      第63回高圧討論会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Pressure effect on superconductivity in the Dirac semimetal PdTe2021

    • Author(s)
      Ayako Ohmura, Huaqian Leng, Luong Ngoc Anh, Fumihiro Ishikawa, Takashi Naka, YingKai Huang, Anne de Visser
    • Organizer
      10th Asian Conference on High Pressure Research
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Pressure-induced phase transitions in bismuth layered alloys2021

    • Author(s)
      Ayako Ohmura
    • Organizer
      Thermec2020 (postponed to 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] ディラック半金属 PdTe2 の超伝導と構造への圧力効果2021

    • Author(s)
      大村彩子,古江優作,田中恭平,藤野唯親,Marc V. Salis,Huaqian Leng,石川文洋,名嘉節,中野智志,YingKai Huang,Anne de Visser
    • Organizer
      第62回高圧討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] ディラック半金属 PdTe2 における超伝導転移温度の圧力依存性2021

    • Author(s)
      古江優作,田中恭平,大村彩子,Marc V. Salis,Huaqian Leng,石川文洋,名嘉節,中野智志,YingKai Huang,Anne de Visser
    • Organizer
      第62回高圧討論会
    • Related Report
      2021 Annual Research Report

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

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