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Experimental study of the new quantum phases and quantum criticalities for hybridized multipole

Research Project

Project/Area Number 17H06602
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeSingle-year Grants
Research Field Condensed matter physics II
Research InstitutionThe University of Tokyo

Principal Investigator

Akito Sakai  東京大学, 物性研究所, 助教 (10806087)

Project Period (FY) 2017-08-25 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
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多極子 / トポロジー / 異常ネルンスト効果 / 物性実験 / 強相関電子系 / 多極子秩序 / 近藤効果 / 熱膨張
Outline of Final Research Achievements

This project was performed to search for the new quantum phases and quantum criticalities in strong correlated multipole systems. As a result, we found PrV2Al20 exhibits ferro-octupole order at low temperatures. Moreover, we found Co2MnGa shows the giant anomalous Nernst effect at room temperature due to the Lifshitz type of quantum criticality of the Weyl points. These results are summarized as the articles and presented in domestic and international conferences including several invited talks. Related to this work, I received the young scientist award from physical society of Japan.

Academic Significance and Societal Importance of the Research Achievements

スピンゆらぎによる超伝導や量子臨界現象の理解が進む一方、多極子による量子物性の理解はあまり進んでいない。本研究は混成する多極子による新しい量子状態の発見を示唆するものであり大きな学術的価値がある。
室温での巨大異常ネルンスト効果を発見し、その発現機構を明らかにしたことは今後の熱電変換やスピントロニクスへの応用を期待させる。またワイル点の量子リフシッツ転移が異常ネルンスト効果の対数的増大に寄与しており、学術的にも大変興味深い。

Report

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

    (13 results)

All 2019 2018 2017

All Journal Article (3 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (10 results) (of which Int'l Joint Research: 4 results,  Invited: 6 results)

  • [Journal Article] Crystal Structure in Quadrupolar Kondo Candidate PrTr2Al20 (Tr = Ti and V)2019

    • Author(s)
      Okuyama Daisuke、Tsujimoto Masaki、Sagayama Hajime、Shimura Yasuyuki、Sakai Akito、Magata Atsushi、Nakatsuji Satoru、Sato Taku J
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 88 Issue: 1 Pages: 015001-015001

    • DOI

      10.7566/jpsj.88.015001

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Giant anomalous Nernst effect and quantum-critical scaling in a ferromagnetic semimetal2018

    • Author(s)
      Sakai Akito、Mizuta Yo Pierre、Nugroho Agustinus Agung、Sihombing Rombang、Koretsune Takashi、Suzuki Michi-To、Takemori Nayuta、Ishii Rieko、Nishio-Hamane Daisuke、Arita Ryotaro、Goswami Pallab、Nakatsuji Satoru
    • Journal Title

      Nature Physics

      Volume: 14 Issue: 11 Pages: 1119-1124

    • DOI

      10.1038/s41567-018-0225-6

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] 量子効果で10倍以上の磁気熱電効果を室温で実現2018

    • Author(s)
      酒井 明人、中辻 知
    • Journal Title

      クリーンエネルギー

      Volume: 28 Pages: 34-34

    • Related Report
      2018 Annual Research Report
  • [Presentation] ワイル強磁性体 Co2MnGa における室温巨大異常ネルンスト効果2019

    • Author(s)
      酒井明人
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] 量子臨界点近傍における新しい物性開拓2019

    • Author(s)
      酒井明人
    • Organizer
      日本物理学会 第74回年次大会
    • Related Report
      2018 Annual Research Report
    • Invited
  • [Presentation] Giant anomalous Nernst effect at room temperature in Co2MnGa2019

    • Author(s)
      Akito Sakai
    • Organizer
      Topological Phases and Functionality of Correlated Electron Systems (TPFC) 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Multipolar order, non-Fermi liquid and heavy fermion superconductivity in the quadrupole Kondo lattice PrTr2Al20 (Tr = Ti, V)2018

    • Author(s)
      Akito Sakai
    • Organizer
      Frustration, Orbital Fluctuations, and Topology in Kondo Lattices and their relatives: International Seminar & Workshop
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Multipole ordering in PrV2Al20 studied by thermal expansion and magnetostriction2018

    • Author(s)
      Akito Sakai
    • Organizer
      International Workshop: Novel Phenomena in Quantum Materials driven by Multipoles and Topology
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 四極子近藤格子系PrV2Al20の多極子秩序2018

    • Author(s)
      酒井 明人, 永岡 靖浩, 志村 恭通, 中辻 知
    • Organizer
      日本物理学会73回年次大会 (JPS 2018 annual meeting)
    • Related Report
      2017 Annual Research Report
  • [Presentation] Multipole ordering in PrV2Al20 studied by thermal expansion and magnetostriction2018

    • Author(s)
      Akito Sakai
    • Organizer
      International Workshop: Novel Phenomena in Quantum Materials driven by Multipoles and Topology
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] PrT2Al20 (T= Ti, V)における 電気四極子の秩序と混成効果2017

    • Author(s)
      酒井明人
    • Organizer
      J-Physics トピカルミーティング 「局在多極子と伝導電子の相関による新現象」
    • Related Report
      2017 Annual Research Report
    • Invited
  • [Presentation] Heavy fermion superconductivity and non-Fermi liquid in the quadrupole Kondo lattice PrTr2Al20 (Tr =Ti, V)2017

    • Author(s)
      Akito Sakai
    • Organizer
      J-Physics 2017:International Workshop on Multipole Physics and Related Phenomena
    • Related Report
      2017 Annual Research Report
  • [Presentation] 四極子近藤格子系PrTr2Al20 (Tr = Ti, V)における 非フェルミ液体と重い電子超伝導2017

    • Author(s)
      酒井明人、辻本真規、松本洋介、志村恭通、冨田崇弘、中辻知
    • Organizer
      11回物性科学領域横断研究会 11th Joint Workshop of Scientific Research on Innovative Areas
    • Related Report
      2017 Annual Research Report

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Published: 2017-08-25   Modified: 2020-03-30  

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