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正方対称場における2電子t2g電子系のスピンと軌道秩序

Research Project

Project/Area Number 17K05521
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Condensed matter physics II
Research InstitutionNational Institute for Materials Science

Principal Investigator

櫻井 裕也  国立研究開発法人物質・材料研究機構, エネルギー・環境材料研究拠点, グループリーダー (60421400)

Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Granted (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywords磁性 / 正方格子 / 高圧物性 / 高圧合成 / クロム酸化物 / t2g電子 / Mott絶縁体 / 新物質 / Cr酸化物 / 蜂の巣格子 / 強相関電子系
Outline of Annual Research Achievements

Sr3V2O7の純良試料を高圧合成により作成しその磁性を明らかにした。バナジウム酸塩を使用し、高圧合成を利用することで酸素不定比性が極めて少ない試料の合成に成功した。これまで報告されていた磁化率の温度変化は比較的大きなCurie-Weiss則にしたがい、110 K付近で異常がみられた。その原因についてはスピングラス、傾角反強磁性、隠れた1次元性による密度波形成など不自然な磁性であると考えられていた。今回合成に成功した純良試料ではCurie-Weiss的な振る舞いが大きく押さえられ、110 Kの異常も見られなかった。すなわち通常のパウリ常磁性であることが分かった。不自然な振る舞いは不純物や欠陥によるものだと考えられる。これらのことを論文にまとめ報告した。
純良な試料を用いてSr2MO4 (M = V, Cr)の電気抵抗、磁化、X線回折測定を様々な圧力温度領域で行い電子相図を完成させた。過去に報告されたものとは異なり、M = Vでは2つの金属相が現れた。M = Crにおいても複雑な電子相図が得られた。イオンのd軌道の電子数と縮退の様子からその複雑な相関係を検討した結果、トポロジカルな性質が示唆された。これらを論文にまとめ報告した。
Ln2Co12P7 (Ln = Y, Nd, Sm)においてNdやSmの磁気モーメントが強磁性秩序したCoの磁気モーメントと反強的に結合することを磁気熱量効果の測定により明らかにした。軽希土類が3d遷移金属イオンの強磁性と反強的に結合することは珍しい。その内容は論文にまとめ報告した。

Current Status of Research Progress
Current Status of Research Progress

3: Progress in research has been slightly delayed.

Reason

日本における液体ヘリウムの供給不足により測定装置が一時停止したため。

Strategy for Future Research Activity

残務は極僅かである。必要な測定を終え、成果を発表する。

Report

(3 results)
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report

Research Products

(24 results)

All 2020 2019 2018 2017 Other

All Int'l Joint Research Journal Article Presentation

  • [Int'l Joint Research] Max Planck Institute/Universitat Freiburg(ドイツ)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] TRIUMF/University of British Columbia/University of Alberta(カナダ)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] Paul Scherrer Institut(スイス)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] KTH Royal Institute of Technology(スウェーデン)

    • Related Report
      2018 Research-status Report
  • [Journal Article] Magnetic Properties of Sr<sub>3</sub>V<sub>2</sub>O<sub>7</sub>2020

    • Author(s)
      SAKURAI Hiroya
    • Journal Title

      J. Jpn. Soc. Powder Powder Metallurgy

      Volume: 67 Issue: 2 Pages: 107-109

    • DOI

      10.2497/jjspm.67.107

    • ISSN
      0532-8799, 1880-9014
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Magnetocaloric Study of <i>Ln</i><sub>2</sub>Co<sub>12</sub>P<sub>7</sub> (<i>Ln</i> = Y, Nd, and Sm)2020

    • Author(s)
      OHTA Hiroto、KATO Yusuke、WATANABE Yusuke、Aruga KATORI Hiroko、TSUJII Naohito、KIKUGAWA Naoki、SAKURAI Hiroya
    • Journal Title

      J. Jpn. Soc. Powder Powder Metallurgy

      Volume: 67 Issue: 2 Pages: 97-99

    • DOI

      10.2497/jjspm.67.97

    • ISSN
      0532-8799, 1880-9014
    • Related Report
      2019 Research-status Report
  • [Journal Article] Metamagnetic Transition and Magnetocaloric Effect of PrMnGe2020

    • Author(s)
      TSUJII Naohito、SAKURAI Hiroya
    • Journal Title

      J. Jpn. Soc. Powder Powder Metallurgy

      Volume: 67 Issue: 2 Pages: 103-106

    • DOI

      10.2497/jjspm.67.103

    • ISSN
      0532-8799, 1880-9014
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Contrasting Pressure-Induced Metallization Processes in Layered Perovskites, α-Sr2MO4 (M=V, Cr)2019

    • Author(s)
      Yamauchi Touru、Shimazu Taku、Nishio-Hamane Daisuke、Sakurai Hiroya
    • Journal Title

      Physical Review Letters

      Volume: 123 Pages: 156601-156601

    • DOI

      10.1103/physrevlett.123.156601

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Ordinary and extraordinary structural phase transitions in the perovskite-related layered compound Sr3W2O92019

    • Author(s)
      Urushihara Daisuke、Asaka Toru、Fukuda Koichiro、Sakurai Hiroya
    • Journal Title

      Physical Review B

      Volume: 99 Pages: 094104-094104

    • DOI

      10.1103/physrevb.99.094104

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Charge disproportionation of mixed-valent Cr triggered by Bi lone-pair effect in the A-site-ordered perovskite BiCu3Cr4O122018

    • Author(s)
      Etter Martin、Isobe Masahiko、Sakurai Hiroya、Yaresko Alexander、Dinnebier Robert E.、Takagi Hidenori
    • Journal Title

      Physical Review B

      Volume: 97 Pages: 195111-195111

    • DOI

      10.1103/physrevb.97.195111

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Giant magnetocapacitance in cerium sesquioxide2018

    • Author(s)
      Kolodiazhnyi T.、Sakurai H.、Avdeev M.、Charoonsuk T.、Lamonova K. V.、Pashkevich Yu. G.、Kennedy B. J.
    • Journal Title

      Physical Review B

      Volume: 98 Pages: 054423-054423

    • DOI

      10.1103/physrevb.98.054423

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] Magnetic structure for NaCr2O4 analyzed by neutron diffraction and muon spin-rotation2018

    • Author(s)
      Nozaki Hiroshi、Sakurai Hiroya、Ofer Oren、Ansaldo Eduardo J.、Brewer Jess H.、Chow Kim H.、Pomjakushin Vladimir、Keller Lukas、Prsa Krunoslav、Miwa Kazutoshi、Mansson Martin、Sugiyama Jun
    • Journal Title

      Physica B: Condensed Matter

      Volume: 551 Pages: 137-141

    • DOI

      10.1016/j.physb.2017.11.011

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Journal Article] High-pressure synthesis and crystal structure of the strontium tungstate Sr3W2O92018

    • Author(s)
      D. Urushihara, T. Asaka, K. Fukuda, H.Sakurai
    • Journal Title

      Acta Crystallographica Section C Structural Chemistry

      Volume: 74 Pages: 120-124

    • DOI

      10.1107/s2053229617017879

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Discovery of the High-Pressure Phase of Ba3W2O9 and Determination of Its Crystal Structure2017

    • Author(s)
      D. Urushihara, T. Asaka, K. Fukuda, H.Sakurai
    • Journal Title

      Inorganic Chemistry

      Volume: 56 Pages: 13007-13013

    • DOI

      10.1021/acs.inorgchem.7b01755

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Electronic phase transition between localized and itinerant states in the solid-solution system CaCu3Ti4-xRuxO122017

    • Author(s)
      Ting-Hui Kao Hiroya Sakurai, Shan Yu, Harukazu Kato, Naohito Tsujii, and Hung-Duen Yang
    • Journal Title

      Physical Review B

      Volume: 95

    • DOI

      10.1103/physrevb.95.195141

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Origin of the magnetic susceptibility maximum in CaCu3Ru4O12 and electronic states in the A-site substituted compounds2017

    • Author(s)
      Ting-Hui Kao, Hiroya Sakurai,Shan Yu, Harukazu Kato, Naohito Tsujii, and Hung-Duen Yang
    • Journal Title

      Physical Review B

      Volume: 96

    • DOI

      10.1103/physrevb.96.024402

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] (La,Sr)n+1MnO3n+1 (n = 1, 2, 3; M = V)の合成と電子物性 ~M = Crの場合との比較~2019

    • Author(s)
      桜井裕也
    • Organizer
      一般社団法人粉体粉末冶金協会2019年度春季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Srn+1CrnO3n+1 (n = 1, 2, 3)の構造相転移と電子状態2019

    • Author(s)
      桜井裕也
    • Organizer
      一般社団法人粉体粉末冶金協会2019年度秋季大会
    • Related Report
      2019 Research-status Report
  • [Presentation] Electronic properties of Ruddlesden-Popper phase V and Cr oxides2019

    • Author(s)
      Sakurai Hiroya
    • Organizer
      International Conference on Strongly Correlated Electron Systems 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] A3M2O9 (A = Sr, Ba; M = W, Re)の結晶構造と電子物性2018

    • Author(s)
      桜井裕也、漆原大典、浅香透、福田功一郎
    • Organizer
      粉体粉末冶金協会春季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] (La,Sr)n+1CrnO3n+1 (n = 1, 2, 3) の合成と電子物性2018

    • Author(s)
      桜井裕也
    • Organizer
      粉体粉末冶金協会秋季大会
    • Related Report
      2018 Research-status Report
  • [Presentation] CaCu3Ti4-xRuxO12 (A = La, Na, Sr)のモット転移2017

    • Author(s)
      桜井裕也、Ting-Hui Kao、余珊、加藤治一、辻井直人、Hung-Duen Yang
    • Organizer
      一般社団法人粉体粉末冶金協会平成29 年度春季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Ca1-xAxCu3Ru4O12 (A = La, Na, Sr)の磁性と電子状態2017

    • Author(s)
      桜井裕也、Ting-Hui Kao、余珊、加藤治一、辻井直人、Hung-Duen Yang
    • Organizer
      一般社団法人粉体粉末冶金協会平成29 年度春季大会
    • Related Report
      2017 Research-status Report
  • [Presentation] Ferromagnetic interactions in rutile-related Cr(IV) oxides2017

    • Author(s)
      Hiroya Sakurai
    • Organizer
      JSPM International Conference on Powder and Powder Metallurgy
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited

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Published: 2017-04-28   Modified: 2021-01-27  

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