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Thermoelectric study of quantum criticality in heavy-fermion metals

Research Project

Project/Area Number 23740263
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Condensed matter physics II
Research InstitutionTokyo Institute of Technology

Principal Investigator

MACHIDA Yo  東京工業大学, 大学院・理工学研究科, 助教 (40514740)

Project Period (FY) 2011 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2012: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2011: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords強相関系 / 重い電子系 / 熱電係数 / 量子臨界点 / 量子臨界現象
Research Abstract

Quantum critical phenomena of the heavy-fermion materials have been studied by the low-temperature thermoelectric coefficient measurements. As a result, distinct nature of quantum criticality between two representative Yb-based quantum critical materials β-YbAlB4 and YbRh 2 Si2 has been revealed by contrasting behaviors of the Seebeck coefficient near their quantum critical points (QCP). Moreover, a satisfactory of the Wiedemann-Franz law has been verified in YbRh 2 Si2 at the QCP. These results place strong constraint on models for the quantum criticality of these materials.

Report

(3 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Research-status Report
  • Research Products

    (19 results)

All 2013 2012 2011 Other

All Journal Article (8 results) (of which Peer Reviewed: 8 results) Presentation (11 results)

  • [Journal Article] Magnetic Field Driven Electronic Singularities through Metamagnetic Phenomena: Case of the Heavy Fermion Antiferromagnet Ce(Ru_0.92Rh_0.08)_2 Si_22013

    • Author(s)
      Y. Mach ida, K. Izawa, D. Aoki, G. Knebel, A.Pourret, and J. Flouquet
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 82 Pages: 54704-54704

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Thermoelectric Response Near a Quantum Critical Point of β-YbAlB_4 and YbRh_2Si_2 : A Comparative Study2012

    • Author(s)
      Y. Machida, K. Tomokuni, C. Ogura, K.Izawa, K. Kuga, S. Nakatsuji, G. Lapertot, G. Knebel, J.-P. Brison, and J. Flouquet
    • Journal Title

      Physical ReviewLetters

      Volume: 109 Pages: 156405-156405

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Twofold Spontaneous Symmetry Breaking in the Heavy-Fermion Superconductor UPt_32012

    • Author(s)
      Y. Machida, A. Itoh, Y. So, K. Izawa, Y.Haga, E. Yamamoto, N. Kimura, Y. Onuki, Y. Tsutsumi, and K. Machida
    • Journal Title

      Physical Review Letters

      Volume: 108 Pages: 157002-157002

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Twofold Spontaneous Symmetry Breaking in the Heavy-Fermion Superconductor UPt32012

    • Author(s)
      Y. Machida
    • Journal Title

      Phys. Rev. Lett.

      Volume: 108 Issue: 15 Pages: 157002-157002

    • DOI

      10.1103/physrevlett.108.157002

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermoelectric response near a quantum critical point of β-YbAlB4 and YbRh_2Si_2: A comparative study2012

    • Author(s)
      Y. Machida, K. Tomokuni, C. Ogura, K. Izawa, K. Kuga, S. Nakatsuji, G. Lapertot, G. Knebel, J.-P. Brison, and J. Flouquet
    • Journal Title

      Phys. Rev. Lett

      Volume: 109 Issue: 15 Pages: 1564051-4

    • DOI

      10.1103/physrevlett.109.156405

    • Related Report
      2012 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Anisotropic Hysteretic Hall Effect and Magnetic Control of Chiral Domains in the Chiral Spin States of Pr_2Ir_2O_72011

    • Author(s)
      L. Balicas, S. Nakatsuji, Y. Machida, and S.Onoda
    • Journal Title

      Physical Review Letters

      Volume: 106 Pages: 217204-217204

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Anisotropic Hysteretic Hall Effect and Magnetic Control of Chiral Domains in the Chiral Spin States of Pr_2Ir_2O_72011

    • Author(s)
      L.Balicas
    • Journal Title

      Physical Review Letters

      Volume: 106 Issue: 21 Pages: 2172041-4

    • DOI

      10.1103/physrevlett.106.217204

    • Related Report
      2011 Research-status Report
    • Peer Reviewed
  • [Journal Article] Verification of the Wiedemann-Franz Law in YbRh_2Si_2 At a Quantum Critical Point

    • Author(s)
      Y. Machida, K. Tomokuni, K. Izawa, G. Lapertot, G. Knebel, J.-P. Brison, and J. Flouquet
    • Journal Title

      Physical Review Letters誌

      Volume: (掲載決定)

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Presentation] 多重超伝導相をもつUPt3の極低温熱ホール伝導率2013

    • Author(s)
      町田洋,伊藤淳史,井澤公一,芳賀芳範,山本悦嗣,木村憲彰,大貫惇睦
    • Organizer
      日本物理学会年次大会
    • Place of Presentation
      広島大学
    • Year and Date
      2013-03-29
    • Related Report
      2012 Final Research Report
  • [Presentation] 多重超伝導相をもつUPt3の極低温熱ホール伝導率2013

    • Author(s)
      町田洋
    • Organizer
      日本物理学会
    • Place of Presentation
      広島大学
    • Related Report
      2012 Annual Research Report
  • [Presentation] 重い電子系Ce(Ru_1-xRh_x)_2 Si_2の極低温熱電2012

    • Author(s)
      町田洋,井澤公一,青木大,A. Pourret, J. Flouquet , K. Behnia
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      横浜国立大学
    • Year and Date
      2012-09-20
    • Related Report
      2012 Final Research Report
  • [Presentation] Thermoelectric study of the metamagnetic behavior in YbCo2 Zn 202012

    • Author(s)
      Y. Machida, T. Ikeura, K. Izawa, S.Yoshiuchi, F. Honda, R. Settai, and Y. Onuki
    • Organizer
      ICM 2012
    • Place of Presentation
      Busan, Korea
    • Year and Date
      2012-07-09
    • Related Report
      2012 Final Research Report
  • [Presentation] 重い電子系化合物YbCo_2Zn_20の低温熱電係数2012

    • Author(s)
      町田洋,池浦徹,井澤公一,吉内伸吾,本多史憲,摂待力生,大貫惇睦
    • Organizer
      日本物理学会年次大会
    • Place of Presentation
      関西学院大学
    • Year and Date
      2012-03-27
    • Related Report
      2012 Final Research Report
  • [Presentation] 重い電子系Ce(Ru1-xRhx)2Si2の極低温熱電応答2012

    • Author(s)
      町田洋
    • Organizer
      日本物理学会
    • Place of Presentation
      横浜国立大学
    • Related Report
      2012 Annual Research Report
  • [Presentation] Thermoelectric study of the metamagnetic behavior in YbCo2Zn202012

    • Author(s)
      町田洋
    • Organizer
      The 19th International Conference on Magnetism
    • Place of Presentation
      韓国釜山
    • Related Report
      2012 Annual Research Report
  • [Presentation] 重い電子系化合物YbCo2Zn20の低温熱電係数2012

    • Author(s)
      町田洋
    • Organizer
      日本物理学会年次大会
    • Place of Presentation
      関西学院大学
    • Related Report
      2011 Research-status Report
  • [Presentation] Comparative Study on Quantum Criticality of β-YbAlB_4 and YbRh_2Si_2 via Thermal Transport Measurements2011

    • Author(s)
      Y. Machida, K. Tomokuni, C. Ogura, K.Izawa, K. Kuga, S. Nakatsuji, G. Lapertot, G. Knebel, J.-P. Brison, and J. Flouquet
    • Organizer
      SCES 2011
    • Place of Presentation
      Cambridge, UK
    • Year and Date
      2011-09-02
    • Related Report
      2012 Final Research Report
  • [Presentation] Comparative Study on Quantum Criticality2011

    • Author(s)
      Y. Machida
    • Organizer
      SCES 2011
    • Place of Presentation
      Cambridge
    • Related Report
      2011 Research-status Report
  • [Presentation] 熱伝導率で見たUPt3における超伝導対称性の変化2011

    • Author(s)
      町田洋
    • Organizer
      日本物理学会秋季大会
    • Place of Presentation
      富山大学
    • Related Report
      2011 Research-status Report

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Published: 2011-08-05   Modified: 2020-05-15  

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