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Development of ultralow-temperature measurement systems by Pomeranchuk cooling

Research Project

Project/Area Number 17K18747
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Yamashita Minoru  東京大学, 物性研究所, 准教授 (10464207)

Project Period (FY) 2017-06-30 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Keywords超低温 / 強相関電子物性 / 強相関電子系
Outline of Final Research Achievements

The purpose of this research project is to develop a new cryostat and measurement systems to extend studies of strongly-correlated electron systems down to ultralow temperatures (~1 mK) from a temperature achieved by a commercial cryostat (~50 mK). We have developed a miniature Pomeranchuk cryostat, and have performed the cooling test of the cryostat. Although we could not confirm the lowest temperature of the cryostat owing to some technical issues, improvements required to resolve these issues have been clarified, accomplishing our goal for this project. In addition, we have succeeded measurements of CeCoIn5 down to ultralow temperatures. From the measurements, we revealed a new ordered phase at ultralow temperatures, which has not been obtained by a commercial cryostat. We believe that these results lay the first stone to extend our research of strongly-correlated electron materials down ultralow temperatures.

Academic Significance and Societal Importance of the Research Achievements

科学研究においてより低温までの研究を行う事は熱揺らぎに隠れていた物質の本質的性質を明らかにするためには必須である。市販の冷凍機で達成可能な温度より低温の超低温領域(~1 mK)での実験には様々な実験的困難があってこれまでほとんど行われてこなかったが、本研究成果はより簡易な方法で超低温を実現するものであり、この温度領域における研究の進展を加速させる結果である。さらに、超低温までのNMR測定からこれまで観測できなかった信号を得ることができ、様々な物質における超低温測定につながる成果である。

Report

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

    (15 results)

All 2019 2018 2017 Other

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results,  Open Access: 2 results) Presentation (7 results) (of which Int'l Joint Research: 5 results,  Invited: 4 results) Remarks (2 results)

  • [Journal Article] Anomalous suppression in the de Haas-van Alphen oscillations of CeCoIn5 at ultra-low temperatures2018

    • Author(s)
      H. Shishido, S. Yamada, K. Sugii, M. Shimozawa, Y. Yanase, and M. Yamashita
    • Journal Title

      Phys. Rev. Lett.

      Volume: 120 Issue: 17 Pages: 177201-177201

    • DOI

      10.1103/physrevlett.120.177201

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Unusual thermal Hall effect in a Kitaev spin liquid candidate α-RuCl32018

    • Author(s)
      Y. Kasahara, K. Sugii, T. Ohnishi, M. Shimozawa, M. Yamashita, N. Kurita, H. Tanaka, J. Nasu, Y. Motome, T. Shibauchi, and Y. Matsuda
    • Journal Title

      Phys. Rev. Lett.

      Volume: 120 Issue: 21 Pages: 217205-217205

    • DOI

      10.1103/physrevlett.120.217205

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spin Thermal Hall Conductivity of a Kagome Antiferromagnet2018

    • Author(s)
      Doki Hayato、Akazawa Masatoshi、Lee Hyun-Yong、Han Jung Hoon、Sugii Kaori、Shimozawa Masaaki、Kawashima Naoki、Oda Migaku、Yoshida Hiroyuki、Yamashita Minoru
    • Journal Title

      Physical Review Letters

      Volume: 121 Issue: 9 Pages: 097203-097203

    • DOI

      10.1103/physrevlett.121.097203

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Quantum-disordered state of magnetic and electric dipoles in an organic Mott system2017

    • Author(s)
      Shimozawa M.、Hashimoto K.、Ueda A.、Suzuki Y.、Sugii K.、Yamada S.、Imai Y.、Kobayashi R.、Itoh K.、Iguchi S.、Naka M.、Ishihara S.、Mori H.、Sasaki T.、Yamashita M.
    • Journal Title

      Nature Communications

      Volume: 8 Issue: 1 Pages: 1-6

    • DOI

      10.1038/s41467-017-01849-x

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Thermal Hall Effect in a Phonon-Glass Ba3CuSb2O92017

    • Author(s)
      Sugii K.、Shimozawa M.、Watanabe D.、Suzuki Y.、Halim M.、Kimata M.、Matsumoto Y.、Nakatsuji S.、Yamashita M.
    • Journal Title

      Physical Review Letters

      Volume: 118 Issue: 14 Pages: 145902-145902

    • DOI

      10.1103/physrevlett.118.145902

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] 格子振動による熱ホール効果2017

    • Author(s)
      杉井かおり、山下穣
    • Journal Title

      固体物理

      Volume: 52 Pages: 783-783

    • NAID

      40021422480

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Spin Thermal Hall Conductivity of a Kagome Antiferromagnet2019

    • Author(s)
      Minoru Yamashita
    • Organizer
      APCTP-KIAS Quantum Materials Symposium 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Spin Thermal Hall Conductivity of a Kagome Antiferromagnet2019

    • Author(s)
      Minoru Yamashita
    • Organizer
      Topological Phases and Functionality of Correlated Electron Systems 2019
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Universal thermal Hall conductivity of a kagome antiferromagnet2018

    • Author(s)
      Minoru Yamashita
    • Organizer
      Novel Phenomena in Quantum Materials driven by Multipoles and Topology
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] CeCoIn5における超低温下NMR測定 III2018

    • Author(s)
      山下穣
    • Organizer
      日本物理学会 2018年秋季大会
    • Related Report
      2018 Annual Research Report
  • [Presentation] dHvA measurements of CeCoIn5 at ultra-low temperatures2017

    • Author(s)
      山下穣
    • Organizer
      SCES2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Quantum Spin Liquids as New Quantum States of Matter2017

    • Author(s)
      山下穣
    • Organizer
      錯体科学第67回討論会
    • Related Report
      2017 Research-status Report
    • Invited
  • [Presentation] Thermal-Hall effects in insulators2017

    • Author(s)
      山下穣
    • Organizer
      Frontiers in Strongly Correlated Electron System
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research / Invited
  • [Remarks] 物性研プレスリリース:格子振動による熱流が磁場で曲がることを発見

    • URL

      http://www.issp.u-tokyo.ac.jp/issp_wms/DATA/OPTION/release20170322.pdf

    • Related Report
      2017 Research-status Report
  • [Remarks] 物性研プレスリリース:電子とプロトンの連動による新しい量子液体状態の発見

    • URL

      http://www.issp.u-tokyo.ac.jp/maincontents/news2.html?pid=3482

    • Related Report
      2017 Research-status Report

URL: 

Published: 2017-07-21   Modified: 2020-03-30  

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