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遷移金属化合物における量子スピン液体状態の単結晶を用いた実験的解明

Research Project

Project/Area Number 14F04026
Research Category

Grant-in-Aid for JSPS Fellows

Allocation TypeSingle-year Grants
Section外国
Research Field Biological physics/Chemical physics/Soft matter physics
Research InstitutionThe University of Tokyo

Principal Investigator

中辻 知  東京大学, 物性研究所, 教授 (70362431)

Co-Investigator(Kenkyū-buntansha) TIAN ZHAOMING  東京大学, 物性研究所, 外国人特別研究員
TIAN Zhaoming  東京大学, 物性研究所, 外国人特別研究員
Project Period (FY) 2014-04-25 – 2016-03-31
Project Status Completed (Fiscal Year 2015)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 2015: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 2014: ¥1,200,000 (Direct Cost: ¥1,200,000)
Keywords遷移金属酸化物 / スピン液体 / トポロジカル量子相 / イリジウム酸化物 / スピン・軌道相互作用 / 金属・絶縁体転移
Outline of Annual Research Achievements

強相関電子系におけるさまざまな新しいトポロジカル量子相の発現の舞台として、我々が開発したPr2Ir2O7を含むパイロクロア型イリジウム酸化物が近年注目を浴びている。この系は典型的トポロジカル絶縁体HgTeと同じ電子構造を持つ、強相関電子系では初めての半金属であることを、物性研究所の近藤猛准教授との角度分解光電子分光(ARPES)とUCSBの理論グループのBalents教授らのバンド計算を用いた直接観察から明らかにした(近藤、Balents,中辻et al Nature Communications (2015))。さらに、Nd2Ir2O7の純良単結晶の合成を行い、その金属・絶縁体転移温度がNdとIrの比に著しく依存することを解明した。さらに純良単結晶を用いた実験から、磁場誘起の金属・絶縁体量子相転移を発見した。さらに、その純良単結晶を用いた研究からPr2Ir2O7とNd2Ir2O7はともに、この量子相転移近傍に位置する2次の波数分散を持つフェルミノード系であることを見出した。(Tian, 金道、Balents、中辻et al Nature Physics (2015))特に、磁場を[100]にかけた場合のみ、巨大な磁気抵抗を伴って、絶縁体・半金属転移が起こることを見出した。このことは、Ndがall-in all-out状態から、2-in 2-out状態に変化することに伴い、近藤カップリングを通じてIrの電子状態がall-in all-out状態から強磁性状態に変化することで、絶縁体から半金属状態に転移することを強く示唆している。

Research Progress Status

27年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

27年度が最終年度であるため、記入しない。

Report

(2 results)
  • 2015 Annual Research Report
  • 2014 Annual Research Report
  • Research Products

    (19 results)

All 2016 2015 2014

All Journal Article (9 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 9 results,  Open Access: 9 results,  Acknowledgement Compliant: 5 results) Presentation (10 results) (of which Invited: 3 results)

  • [Journal Article] Field-Induced quantum metal-insulator transition in the pyrochlore iridate Nd2Ir2O72016

    • Author(s)
      Zhaoming Tian, Yoshimitsu Kohama, Takahiro Tomita, Hiroaki Ishizuka, Timothy H. Hsieh, Jun J. Ishikawa, Koichi Kindo, Leon Balents, and Satoru Nakatsuji
    • Journal Title

      Nature Physics

      Volume: 12 Issue: 2 Pages: 134-138

    • DOI

      10.1038/nphys3567

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Experimental exploration of novel semimetal state in strongly anisotropic Pyrochlore iridate Nd2Ir2O7 under high magnetic field2016

    • Author(s)
      Z. M. Tian, Y. Kohama, T. Tomita, J. Ishikawa, H. Mario, K. Kindo, and S. Nakatsuji
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 683 Pages: 012024-012024

    • DOI

      10.1088/1742-6596/683/1/012024

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Frustrated magnetism in a Mott insulator based on a transition metal chalcogenide2016

    • Author(s)
      S Kawamoto, T Higo, T Tomita, S Suzuki, Z M Tian, K Mochitzuki, A Matsuo, K Kindo and S Nakatsuji
    • Journal Title

      Journal of Physics: Conference Series

      Volume: 683 Pages: 012025-012025

    • DOI

      10.1088/1742-6596/683/1/012025

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] High-Field Multi-Frequency ESR in the Rare-Earth Spinel Compound CdYb2S42015

    • Author(s)
      D. Yoshizawa, T. Kida, S. Nakatsuji, K. Iritani, M. Halim, T. Takeuchi and M. Hagiwara
    • Journal Title

      Appl. Magn. Reson.

      Volume: N/A Issue: 9 Pages: 0937-9347

    • DOI

      10.1007/s00723-015-0651-x

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Quantum criticality in a metallic spin liquid2014

    • Author(s)
      Y. Tokiwa, J. J. Ishikawa, S. Nakatsuji and P. Gegenwart
    • Journal Title

      Nature Mater.

      Volume: 13 Issue: 4 Pages: 356-359

    • DOI

      10.1038/nmat3900

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Magnetic and Thermal Properties of the Single Crystalline Pr2Zr2O7 in a [111] field2014

    • Author(s)
      K. Kimura and S. Nakatsuji
    • Journal Title

      JPS Conf. Proc

      Volume: 3

    • DOI

      10.7566/jpscp.3.014027

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] X-ray Photoemission and X-ray Absorption Spectroscopy of Hexagonal Ba3CuSb2O92014

    • Author(s)
      T. Sugimoto, T. Mizokawa, H. Wadati, K. Takubo, A. Damascelli, T. Z. Regier, G. A. Sawatzky, N. Katayama, H. Sawa, K. Kimura and S. Nakatsuji
    • Journal Title

      J. Phys. Soc. Jpn

      Volume: 63 Pages: 549-550

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] 銅酸化物磁性体におけるスピン・軌道の特異な量子状態2014

    • Author(s)
      澤 博, 中辻 知
    • Journal Title

      固体物理

      Volume: 49 Pages: 533-543

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access / Acknowledgement Compliant
  • [Journal Article] Electronic Structure of Quantum Spin-liquid Coupound Ba3CuSb2O92014

    • Author(s)
      T. Sugimoto, T. Mizokawa, H. Wadati, K. Takubo, A. Damascelli, T. Z. Regier, G. A. Sawatzky, N. Katayama, H. Sawa, K. Kimura and S. Nakatsuji
    • Journal Title

      J. Phys. Soc. Jpn.

      Volume: 3 Pages: 1-4

    • DOI

      10.7566/jpscp.3.014007

    • Related Report
      2014 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] パイロクロア型イリジウム酸化物における低温下の熱膨張と熱電能測定2015

    • Author(s)
      冨田崇弘,鈴木慎太郎、Robert K¨uchler、Kamran Benia、Z. M. Tian、松本洋介、中辻知
    • Organizer
      第9 回物性科学領域横断研究会 凝縮系科学の最前線
    • Place of Presentation
      東京大学小柴ホール(東京都・文京区)
    • Year and Date
      2015-11-13
    • Related Report
      2015 Annual Research Report
  • [Presentation] Exotic topological semimetal states in pyrochlore iridates2015

    • Author(s)
      Z. M. Tian
    • Organizer
      Topological phase in correlated electron system workshop
    • Place of Presentation
      東北大学(宮城県・仙台市)
    • Year and Date
      2015-11-06
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] Experimental exploration of novel semimetal state in strong anisotropic pyrochlore iridate Nd2Ir2O7 under high magnetic field2015

    • Author(s)
      Z. M. Tian
    • Organizer
      首都大学東京 International Symposium 2015 “New quantum phase emerging from novel crystal strucutur”e
    • Place of Presentation
      首都大学東京(東京都・八王子市)
    • Year and Date
      2015-09-24
    • Related Report
      2015 Annual Research Report
  • [Presentation] Strong anisotropic magnetotransport in pyrochlore iridate Nd2Ir2O7 single crystal2015

    • Author(s)
      Z. M. Tian
    • Organizer
      日本物理学会2015年秋季大会
    • Place of Presentation
      関西大学(大阪府・吹田市)
    • Year and Date
      2015-09-16
    • Related Report
      2015 Annual Research Report
  • [Presentation] パイロクロア型イリジウム酸化物における低温下の熱膨張と熱電能測定2015

    • Author(s)
      冨田崇弘,鈴木慎太郎、Robert K¨uchler、Kamran Benia, Z. M. Tian、松本洋介、中辻知
    • Organizer
      日本物理学会2015年秋季大会
    • Place of Presentation
      関西大学(大阪府・吹田市)
    • Year and Date
      2015-09-16
    • Related Report
      2015 Annual Research Report
  • [Presentation] パイロクロア型イリジウム酸化物における低温下の熱膨張と熱電能測定2015

    • Author(s)
      冨田崇弘,鈴木慎太郎、Robert K¨uchler、Kamran Benia、Z. M. Tian、松本洋介、中辻知
    • Organizer
      J-Physics:多極子伝導系の物理キックオフミーティング
    • Place of Presentation
      神戸大学総合拠点コンベンションホール(兵庫県・神戸市)
    • Year and Date
      2015-09-14
    • Related Report
      2015 Annual Research Report
  • [Presentation] “Quantum Melting of Spin Ice”2015

    • Author(s)
      S. Nakatsuji
    • Organizer
      Edgar Luscher Seminar 2015 “Neues aus der Festkorperphysik”
    • Place of Presentation
      Hotel-Sport Klosters/Schweiz, Switzerland
    • Year and Date
      2015-02-07 – 2015-02-13
    • Related Report
      2014 Annual Research Report
    • Invited
  • [Presentation] "Anisotropic magnetism and magnetoresistance of Nd2Ir2O7 single crystal"2014

    • Author(s)
      T. Zhaoming
    • Organizer
      新量子相研究会
    • Place of Presentation
      強羅星雲荘セミナー室 神奈川県足柄下郡箱根町
    • Year and Date
      2014-11-27 – 2014-11-28
    • Related Report
      2014 Annual Research Report
  • [Presentation] “Emergent excitations in spin liquids through coupling with electrons and orbitals”2014

    • Author(s)
      S. Nakatsuji
    • Organizer
      7th International Conference on Highly Frustrated Magnetism 2014(基調講演)
    • Place of Presentation
      Cambridge University, UK
    • Year and Date
      2014-07-07 – 2014-07-11
    • Related Report
      2014 Annual Research Report
  • [Presentation] “Topological excitations and anomalous semi-metallic phase in Pr based pyrochlore oxides”2014

    • Author(s)
      S. Nakatsuji
    • Organizer
      OIST International Workshp on Novel Quantum Materials and Phases
    • Place of Presentation
      OIST, Okinawa, Japan
    • Year and Date
      2014-05-13 – 2014-05-17
    • Related Report
      2014 Annual Research Report
    • Invited

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Published: 2015-01-22   Modified: 2024-03-26  

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