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Anomalous thermoelectric effect derived from strongly correlated electrons

Research Project

Project/Area Number 25420723
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Inorganic materials/Physical properties
Research InstitutionNational Institute for Materials Science

Principal Investigator

Isobe Masaaki  国立研究開発法人物質・材料研究機構, 機能性材料研究拠点・強相関物質グループ, グループリーダー (10354309)

Co-Investigator(Kenkyū-buntansha) 新井 正男  国立研究開発法人物質・材料研究機構, 国際ナノアーキテクトニクス研究拠点・材料特性理論グループ, 主席研究員 (40222723)
Project Period (FY) 2013-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2014: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords熱電材料 / 遷移金属酸化物 / 強相関電子系 / 磁性 / 計算物理 / 遷移金属化合物
Outline of Final Research Achievements

We have studied thermoelectric properties and electronic structure of the novel cobalt oxide Ca1-xNaxCo2O4 (0<= x <= 0.6). The Na-substituted phases with x = 0.5 ~ 0.6 exhibit metallic behavior of transport properties with large thermoelectric power comparable to those in layered cobalt oxides. We found that the Ca1-xNaxCo2O4 metallic phases have 1-dimensional-like large Fermi surfaces on the Gamma-Y direction in the momentum space. Wilson ratio is estimated to be 2 ~ 3, which is moderately strong electronic correlation. Origin of the large thermoelectric power is discussed from the viewpoint of the band structure and the electronic correlation in the 3d electron system.

Report

(5 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • 2014 Research-status Report
  • 2013 Research-status Report
  • Research Products

    (30 results)

All 2016 2015 2014 2013

All Journal Article (14 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 14 results,  Acknowledgement Compliant: 1 results,  Open Access: 5 results) Presentation (16 results) (of which Int'l Joint Research: 3 results,  Invited: 5 results)

  • [Journal Article] Superconductivity in noncentrosymmetric SrAuSi32016

    • Author(s)
      Masaaki Isobe, Masao Arai, and Naoki Shirakawa
    • Journal Title

      Physical Review B

      Volume: 93 Issue: 5

    • DOI

      10.1103/physrevb.93.054519

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Two-Magnon Scattering in Spin&#8211;Orbital Mott Insulator Ba2IrO42016

    • Author(s)
      Shunsuke Tsuda, Hirotaka Okabe, Masaaki Isobe, and Shinya Uji
    • Journal Title

      Journal of the Physical Society of Japan

      Volume: 85 Issue: 2 Pages: 023703-023703

    • DOI

      10.7566/jpsj.85.023703

    • NAID

      210000133818

    • Related Report
      2015 Research-status Report
    • Peer Reviewed
  • [Journal Article] Superconductivity and crystal structural origins of the metal-insulator transition in Ba6-xSrxNb10O30 tetragonal tungsten bronzes2015

    • Author(s)
      Taras Kolodiazhnyi, Hiroya Sakurai, Masaaki Isobe, Yoshitaka Matsushita, Scott Forbes, Yurij Mozharivskyj, Timothy J. S. Munsie, Graeme M. Luke, Mary Gurak, and David R. Clarke
    • Journal Title

      Physical Review B

      Volume: 92 Issue: 21 Pages: 214508-214508

    • DOI

      10.1103/physrevb.92.214508

    • Related Report
      2015 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] SrAuSi3: A Noncentrosymmetric Superconductor2014

    • Author(s)
      Masaaki Isobe, Hiroyuki Yoshida, Koji Kimoto, Masao Arai, Eiji Takayama-Muromachi
    • Journal Title

      Chem. Mater.

      Volume: 26 Issue: 6 Pages: 2155-2165

    • DOI

      10.1021/cm500032u

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] The electronic structure of the high-symmetry perovskite iridate Ba2IrO42014

    • Author(s)
      S. Moser, L. Moreschini, A. Ebrahimi, B. Dalla Piazza, M. Isobe, H. Okabe, J. Akimitsu, V. V. Mazurenko, K. S. Kim, A. Bostwick, E. Rotenberg, J. Chang, H. M. Rønnow, M. Grioni
    • Journal Title

      New J. Phys.

      Volume: 16 Issue: 1 Pages: 13008-1

    • DOI

      10.1088/1367-2630/16/1/013008

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Orbital occupancies and the putative jeff = 1/2 ground state in Ba2IrO4: A combined oxygen K-edge XAS and RIXS study2014

    • Author(s)
      M. Moretti Sala, M. Rossi, S. Boseggia, J. Akimitsu, N. B. Brookes, M. Isobe, M. Minola, H. Okabe, H. M. Rønnow, L. Simonelli, D. F. McMorrow, and G. Monaco
    • Journal Title

      Phys. Rev. B

      Volume: 89 Issue: 12

    • DOI

      10.1103/physrevb.89.121101

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bulk nature of layered perovskite iridates beyond the Mott scenario : An approach from a bulk- sensitive photoemission study2014

    • Author(s)
      A. Yamasaki, H. Fujiwara, M. Sing, A. Sekiyama, and S. Suga(最終著者他22名)
    • Journal Title

      Phys. Rev. B

      Volume: 89 Issue: 12 Pages: 121111-121111

    • DOI

      10.1103/physrevb.89.121111

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spin-Orbit-Coupling-Induced jeff States in Perovskite Iridates Studied by Photoemission Spectroscopy2014

    • Author(s)
      A. YAMASAKI, O. KIRILMAZ, A. IRIZAWA, A. HIGASHIYA, T. MURO, H. FUJIWARA, F. PFAFF, P. SCHEIDERER, J. GABEL, M. SING, M. YABASHI, K. TAMASAKU, A. HLOSKOVSKYY, H. OKABE, H. YOSHIDA, M. ISOBE, J. AKIMITSU, W. DRUBE, T. ISHIKAWA, S. IMADA, A. SEKIYAMA, R. CLAESSEN, S. SUGA
    • Journal Title

      JPS Conf. Proc.

      Volume: 3

    • DOI

      10.7566/jpscp.3.013001

    • Related Report
      2014 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Carrier doping effect for transport properties of a spin-orbit Mott insulator Ba2IrO42013

    • Author(s)
      H. Okabe, M. Isobe, E. Takayama- Muromachi, N. Takeshita, and J. Akimitsu
    • Journal Title

      Phys. Rev. B

      Volume: 88 Issue: 7

    • DOI

      10.1103/physrevb.88.075137

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Partially disordered spin structure in Ag2CrO2 studied with mu+SR2013

    • Author(s)
      J. Sugiyama, H. Nozaki, K. Miwa, H. Yoshida, M. Isobe, K. Prsa, A. Amato, D. Andreica, and M. Mansson
    • Journal Title

      Physical Review B

      Volume: 88 Issue: 18

    • DOI

      10.1103/physrevb.88.184417

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Direct observation and dynamics of spontaneous skyrmion-like magnetic domains in a ferromagnet2013

    • Author(s)
      M. Nagao, Y.-Gi So, H. Yoshida, M. Isobe, T. Hara, K. Ishizuka, and K. Kimoto
    • Journal Title

      Nature Nanotechnology

      Volume: 8 Issue: 5 Pages: 325-328

    • DOI

      10.1038/nnano.2013.69

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] McMorrow, Robustness of basal-plane antiferromagnetic order and the Jeff = 1/2 state in single-layer iridate spin-orbit Mott insulators2013

    • Author(s)
      S. Boseggia, R. Springell, H. C. Walker, Ch. Rüegg, H. Okabe, M. Isobe, R. S. Perry, S. P. Collins, D. F. McMorrow
    • Journal Title

      Phys. Rev. Lett.

      Volume: 110 Issue: 11

    • DOI

      10.1103/physrevlett.110.117207

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Pressure-induced metal-insulator transition of the mott insulator Ba2IrO42013

    • Author(s)
      D. Orii, M. Sakata, A. Miyake, K. Shimizu, H. Okabe, M. Isobe, E. Takayama-Muromachi, J. Akimitsu
    • Journal Title

      Journal of the Korean Physical Society

      Volume: 63 Issue: 3 Pages: 349-351

    • DOI

      10.3938/jkps.63.349

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Journal Article] Magnetic States in Quasi-2-D Iridium Oxides with Large Spin-orbit Coupling2013

    • Author(s)
      M. Isobe, H. Okabe, J. Akimitsu
    • Journal Title

      Journal of the Korean Physical Society

      Volume: 63 Issue: 3 Pages: 394-397

    • DOI

      10.3938/jkps.63.394

    • Related Report
      2013 Research-status Report
    • Peer Reviewed
  • [Presentation] Magnetic and Transport Properties of the Spin-Orbit Mott Insulating Antiferromagnet Ba2IrO42016

    • Author(s)
      Masaaki Isobe
    • Organizer
      EMN (Energy Materials Nanotechnology) Meeting on Magnetic Materials
    • Place of Presentation
      Hawaii, USA
    • Year and Date
      2016-03-21
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Ba2IrO4: Spin-Orbit Mott State and its Carrier Doping Effect2015

    • Author(s)
      Masaaki Isobe
    • Organizer
      EMN (Energy Materials Nanotechnology) Bangkok Meeting 2015
    • Place of Presentation
      Bangkok, Thailand
    • Year and Date
      2015-11-10
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 対称中心を持たない新物質SrAuSi3の超伝導状態2015

    • Author(s)
      磯部雅朗,新井正男,室町英治
    • Organizer
      日本物理学会2015年秋季大会
    • Place of Presentation
      関西大学千里山キャンパス、大阪府吹田市
    • Year and Date
      2015-09-16
    • Related Report
      2015 Research-status Report
  • [Presentation] Ba2IrO4: Carrier doping effect on the spin-orbit Mott state2015

    • Author(s)
      Masaaki Isobe
    • Organizer
      EMN (Energy Materials Nanotechnology) Qingdao Meeting 2015
    • Place of Presentation
      Qingdao, China
    • Year and Date
      2015-06-14
    • Related Report
      2015 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 高圧合成の新物質Ag2FeO2とAg2CrO2の積層不整2014

    • Author(s)
      磯部雅朗・小野田みつ子・吉田紘行
    • Organizer
      平成26年度日本結晶学会年会
    • Place of Presentation
      東京大学、東京
    • Year and Date
      2014-11-01 – 2014-11-03
    • Related Report
      2014 Research-status Report
  • [Presentation] 空間反転対称性の破れた超伝導体SrAuSi3の合成と物性2014

    • Author(s)
      磯部雅朗,木本浩司,新井正男,室町英治
    • Organizer
      日本物理学会2014年秋季大会
    • Place of Presentation
      中部大学、春日井市
    • Year and Date
      2014-09-07 – 2014-09-10
    • Related Report
      2014 Research-status Report
  • [Presentation] A novel gold-based superconductor SrAuSi32014

    • Author(s)
      M. Isobe
    • Organizer
      EMN (Energy Materials Nanotechnology) summer meeting 2014
    • Place of Presentation
      The Westin Resort & Spa, Cancun, Mxico
    • Year and Date
      2014-06-09 – 2014-06-12
    • Related Report
      2014 Research-status Report
    • Invited
  • [Presentation] 空間反転対称性の破れた新しい超伝導体SrAuSi32014

    • Author(s)
      磯部雅朗、吉田紘行、木本浩司、新井正男、室町英治
    • Organizer
      日本物理学会第69回年次大会
    • Place of Presentation
      広島大学(東広島市)
    • Related Report
      2013 Research-status Report
  • [Presentation] New-materials search for noncentrosymmetric superconductors2013

    • Author(s)
      Masaaki Isobe
    • Organizer
      Mott Physics Beyond the Heisenberg Model (MPBH2013)
    • Place of Presentation
      Centro Stefano Franscini - Swiss Federal Institute of Technology,Acsona,Switzerland
    • Related Report
      2013 Research-status Report
    • Invited
  • [Presentation] Magnetic susceptibility of a spin-orbit Mott insulator Ba2IrO42013

    • Author(s)
      M. Isobe, H. Okabe, E. Takayama-Muromachi, and J. Akimitsu
    • Organizer
      The Internal Conference on Strongly Correlated Electron Systems (SCES2013)
    • Place of Presentation
      Ito International Research Center Conference, The University of ,Tokyo, Japan
    • Related Report
      2013 Research-status Report
  • [Presentation] Magnetic properties of carrier-doped Ba2IrO4 probed by mSR2013

    • Author(s)
      H. Okabe, M. Isobe, E. Takayama-Muromachi, A. Koda, M. Hiraishi, M. Miyazaki, Y. Kadono, Y. Miyake, and J. Akimitsu
    • Organizer
      The Internal Conference on Strongly Correlated Electron Systems (SCES2013)
    • Place of Presentation
      Ito International Research Center Conference, The University of ,Tokyo, Japan
    • Related Report
      2013 Research-status Report
  • [Presentation] Structural and transport properties of carrier-doped Ba2IrO42013

    • Author(s)
      H. Okabe, M. Isobe, E. Takayama-Muromachi, N. takeshita, and J. Akimitsu
    • Organizer
      The Internal Conference on Strongly Correlated Electron Systems (SCES2013)
    • Place of Presentation
      Ito International Research Center Conference, The University of ,Tokyo, Japan
    • Related Report
      2013 Research-status Report
  • [Presentation] Doping effect on the Jeff = 1/2 Mott insulator Ba2IrO42013

    • Author(s)
      H. Okabe, M. Isobe, E. Takayama-Muromachi, N. Takeshita, A. koda, M. Hiraishi, M. Miyazaki. Y. Kadono, Y. Miyake, and J. Akimitsu
    • Organizer
      International Workshop on Novel Superconductors and Super Materials
    • Place of Presentation
      品川グランドホール(東京)
    • Related Report
      2013 Research-status Report
  • [Presentation] muSR study of the magnetic state in layered iridates2013

    • Author(s)
      H. Okabe, M. Isobe, E. Takayama-Muromachi, N. Takeshita, A. koda, M. Hiraishi, M. Miyazaki. Y. Kadono, Y. Miyake, and J. Akimitsu
    • Organizer
      Light and Particle Beams in Materials Science 2013
    • Place of Presentation
      つくば国際会議場(つくば市)
    • Related Report
      2013 Research-status Report
  • [Presentation] YbB2C2の単結晶育成と物性評価2013

    • Author(s)
      岡部博孝、吉田紘行、磯部雅朗、松下能孝、佐藤晃、室町英治、秋光純
    • Organizer
      日本物理学会2013年秋期大会
    • Place of Presentation
      徳島大学常三島キャンパス(徳島市)
    • Related Report
      2013 Research-status Report
  • [Presentation] 空間反転対称性の破れた超伝導体Ag2Pd3Sの物性2013

    • Author(s)
      吉田紘行、岡部博孝、松下能孝、室町英治、磯部雅朗
    • Organizer
      日本物理学会2013年秋期大会
    • Place of Presentation
      徳島大学常三島キャンパス(徳島市)
    • Related Report
      2013 Research-status Report

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Published: 2014-07-25   Modified: 2019-07-29  

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