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search for superconductivity in high-Tc candidate materials

Research Project

Project/Area Number 18K04695
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 26020:Inorganic materials and properties-related
Research InstitutionYokohama National University

Principal Investigator

Uehara Masatomo  横浜国立大学, 大学院工学研究院, 准教授 (60323929)

Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywords高温超伝導 / Ni酸化物 / ドーピング / 層状化合物 / 高温超伝導候補物質 / Ln4Ni3O8 / superconductivity / layerd Ni oxide / Pd酸化物 / 新超伝導体
Outline of Final Research Achievements

In Ni and Pd oxides, we tried to find superconductivity. In Ni oxide, in order to induce superconductivity, the removal of excess oxygen and appropriate carrier tuning are necessary. we achieved the removal of excess oxygen and found that Ni site substitution is promising method for carrier tuning, however appropriate carrier tuning could not be done adquently. In Pd oxide, we found that the carrier tuning is possible by the replacement of O ions by F ions, using NaCl-NaF flux during synthesis. In both compounds, we have reached at just before the appearance of superconductivity and these results are relevant information for realization of superconductivity.

Academic Significance and Societal Importance of the Research Achievements

室温超伝導物質はエネルギー問題解決に資する材料である。現在、常圧下で最高の超伝導転移温度(Tc)を持つ物質は銅酸化物高温超伝導体(HTSC)であり、そのTc は130 Kであるが、電子状態の調整で室温超伝導が発現する可能性がある。しかし機構が完全に解明されていないため、Tc を上げるにための明確な指針は得られていない。
今回の研究で取り上げたNi,Pd酸化物はHTSCと構造・電子状態がよく似ているので超伝導が発現すればHTSCと詳細に比較することによりTc上昇の必須条件が抽出できる。本研究ではNi,Pd酸化物での超伝導発現の一歩手前まで近づき、今後の研究への重要な情報を与えたものである。

Report

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

    (11 results)

All 2022 2021 2020 2019 2018

All Journal Article (2 results) (of which Open Access: 2 results,  Peer Reviewed: 1 results) Presentation (9 results) (of which Int'l Joint Research: 2 results,  Invited: 1 results)

  • [Journal Article] 高温超伝導候補物質 Pr4Ni3O8 の Ni サイトへの選択的元素置換の試み2021

    • Author(s)
      宮武知範,塚本達,上原政智
    • Journal Title

      Photon Factory Activity Report 2020 #38 (2021)

      Volume: 38 Pages: 174-174

    • Related Report
      2021 Annual Research Report
    • Open Access
  • [Journal Article] Chemical Substitution Effect of High-Tc Superconductor Candidate R4Ni3O8 (R: Rare-earth)2020

    • Author(s)
      Miyatake Tomonori、Shibutani Sho、Hamada Kyohei、Gouchi Jun、Uwatoko Yoshiya、Wakiya Kazuhei、Umehara Izuru、Uehara Masatomo
    • Journal Title

      JPS Conference Proceedings

      Volume: 30 Pages: 1-6

    • DOI

      10.7566/jpscp.30.011061

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 高温超伝導候補物質R4Ni3-xMxO8 (R : 希土類, M : 遷移金属) の合成と物性測定VI2022

    • Author(s)
      宮武知範, 塚本達, 和光勇輝, 梅原出, 上原政智
    • Organizer
      日本物理学会2022年第77回年次大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 高温超伝導候補物質R4Ni3-xMxO8 (R:希土類, M:遷移金属) の合成と物性測定V2021

    • Author(s)
      宮武知範, 塚本達, 和光勇輝, 梅原出, 上原政智
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 高温超伝導候補物質R4Ni3-xMxO8 (R:希土類, M:遷移金属) の合成と物性測定IV2021

    • Author(s)
      宮武知範, 梅原出, 上原政智
    • Organizer
      第76回年次大会 日本物理学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 高温超伝導候補物質R4Ni3-xMxO8 (R : 希土類, M : 遷移金属) の合成と物性測定II2020

    • Author(s)
      宮武知範, 渋谷翔, 濱田恭平, 脇舎和平, 梅原出, 上原政智
    • Organizer
      第75回年次大会 日本物理学会
    • Related Report
      2020 Research-status Report
  • [Presentation] 高温超伝導候補物質R4Ni3-xMxO8 (R : 希土類, M : 遷移金属) の合成と物性測定II2020

    • Author(s)
      ○宮武知範, 渋谷翔, 濱田恭平, 脇舎和平, 梅原出, 上原政智
    • Organizer
      日本物理学会 第75回年次大会
    • Related Report
      2019 Research-status Report
  • [Presentation] 高温超伝導候補物質R4Ni3-xMxO8 (R:希土類, M:遷移金属) の合成と物性測定2019

    • Author(s)
      ○宮武知範, 渋谷翔, 濱田恭平, 郷地順, 上床美也, 脇舎和平, 梅原出, 上原政智
    • Organizer
      日本物理学会 2019年秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Tuning of Carrier Concentration by Chemical Doping to Ni-sites in High-TC Candidate R4Ni3O8 (R = Pr, Nd)2019

    • Author(s)
      ○T. Miyatake, S. Shibutani, K. Hamada, J. Gouchi, Y. Uwatoko, K. Wakiya, I. Umehara, M. Uehara
    • Organizer
      International Conference on Strongly Correlated Electron Systems (SCES2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 高温超伝導候補物質Nd4Ni3O8のNi(1)サイト元素置換によるキャリア調整2019

    • Author(s)
      渋谷翔, 宮武知範, 脇舎和平, 梅原出, 上原政智
    • Organizer
      日本物理学会2018年第74回年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] High-Tc Candidates Materials Ln4Ni3O8and Ln3Ni2O6 (Ln=La, Nd, Sm)2018

    • Author(s)
      M. Uehara
    • Organizer
      International Condensed Matter and Material Science Conference 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2018-04-23   Modified: 2023-01-30  

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