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Superconductivity and anomalous metals near metal-insulator transitions

Research Project

Project/Area Number 19740224
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeSingle-year Grants
Research Field Condensed matter physics II
Research InstitutionNagoya University

Principal Investigator

SHIMIZU Yasuhiro  Nagoya University, 高等研究院, 特任講師 (00415184)

Project Period (FY) 2007 – 2008
Project Status Completed (Fiscal Year 2008)
Budget Amount *help
¥3,690,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2008: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2007: ¥2,000,000 (Direct Cost: ¥2,000,000)
Keywords金属絶縁体転移 / 超伝導 / 核磁気共鳴 / 強相関電子系 / 分子性導体 / 遷移金属酸化物 / 超高圧 / フラストレーション / 電気抵抗
Research Abstract

強相関電子系における超伝導発現の起源を調べるために, 幾何学的なフラストレーションをもつ有機モット絶縁体およびバナジウム酸化物絶縁体における金属-絶縁体転移、超伝導相近傍の金属相の異常性を調べた. 有機モット絶縁体においては, 共有結合固体とよばれる非磁性モット絶縁体からの磁場誘起絶縁体-金属転移し, 非フェルミ液体的な電気抵抗の挙動を見出した. バナジウム酸化物においては, 9GPa 下の高圧下NMRの実験手法を確立し, 反強磁性秩序をもつ電荷整列絶縁体から, フェルミ液体的な帯磁率を示す金属相への一次転移を観測した. いずれもこれまでに知られていないタイプの絶縁体-超伝導転移の発見であり, 強相関電子系における超伝導の普遍性を高める成果である.

Report

(3 results)
  • 2008 Annual Research Report   Final Research Report ( PDF )
  • 2007 Annual Research Report
  • Research Products

    (44 results)

All 2009 2008 2007 Other

All Journal Article (17 results) (of which Peer Reviewed: 17 results) Presentation (26 results) Remarks (1 results)

  • [Journal Article] High-pressure ^<51>V NMR study of the magnetic phase diagram and metal-insulator transition in the quasi-one-dimensional β-Na_<0.33>V_2O_52009

    • Author(s)
      T. Suzuki, I. Yamauchi, Y. Shimizu, M. Itoh, N. Takeshita, C. Terakura, H. Takagi, Y. Tokura, T. Yamauchi, Y. Ueda
    • Journal Title

      Physical Review B 79巻

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Spin Dynamics of the Frustrated Ferromagnetic-Chain System Ca_3Co_2O_62009

    • Author(s)
      H. Nanba, M. Horibe, T. Takami, Y. Shimizu, M. Itoh
    • Journal Title

      J. Physics: Conf. Series 150巻

      Pages: 42140-42140

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Metal-Insulator Transition in the Hollandite Vanadate K_2V_8O_<16> Investigated by ^<51>V NMR Measurements2009

    • Author(s)
      K. Okai, M. Itoh, Y. Shimizu, M. Isobe, J. Yamaura, Y. Ueda
    • Journal Title

      J. Physics: Conf. Series 150巻

      Pages: 42155-42155

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Microscopic Observation of the Spin-Singlet Cluster in the Frustrated Spinel AlV_2O_42009

    • Author(s)
      Y. Shimizu, M. Tanaka, M. Itoh, T. Katsufuji
    • Journal Title

      J. Physics: Conf. Series 150巻

      Pages: 42181-42181

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Local Spin Susceptibility in the Metallic Phase of the Quasi-One-Dimensional Conductor β-Li_<0.33>V_2O_52009

    • Author(s)
      I. Yamauchi, M. Itoh, Y. Shimizu, T. Yamauchi, Y. Ueda
    • Journal Title

      J. Physics: Conf. Series 150巻

      Pages: 42236-42236

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Spin Diffusion in the Quasi-One-Dimensional Conductor β-Na0.33V2O52009

    • Author(s)
      I. Yamauchi, M. Itoh, Y. Shimizu, T. Yamauchi, Y. Ueda
    • Journal Title

      J. Physics: Conf. Series 150巻

      Pages: 42237-42237

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] High-pressure ^<51>V NMR study of the magnetic phase diagram and metal-insulator transition in the quasi-one-dimensional β-Na_<0.33>V_2O_52009

    • Author(s)
      T. Suzuki, I. Yamauchi, Y. Shimizu, M. Itoh, N. Takeshita, C. Terakura, H. Takagi, Y. Tokura, T. Yamauchi, Y Ueda
    • Journal Title

      Physical Review B 79

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spin-singlet formation in the geometrically frustrated spinel oxide AlV_2O_4 : ^<51>V and ^<27>Al NMR measurements2008

    • Author(s)
      Y. Shimizu, M. Takana, M. Itoh, T. Katsufuji
    • Journal Title

      Physical Review B 78巻

      Pages: 14423-14423

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Thermodynamic properties of a spin-1/2 spin-liquid in a κ-type organic salt2008

    • Author(s)
      S. Yamashita, Y. Nakazawa, M. Oguni, Y. Oshima, H. Nojiri, Y. Shimizu, K. Miyagawa, K. Kanoda
    • Journal Title

      Nature Physics 4巻

      Pages: 459-459

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Spin-singlet formation in the geometrically frustrated spinel oxide AlV_2O_4 : ^<51>V and ^<27>Al NMR measurements2008

    • Author(s)
      Y. Shimizu, M. Tanaka, M. Itoh, T. Katsufuji
    • Journal Title

      Physical Review B 78

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Thermodynamic properties of a spin-1/2 spin-liquid in a k-type organic salt2008

    • Author(s)
      S. Yamashita, Y. Nakazawa, M. Oguni, Y. Oshima, H. Nojiri, Y. Shimizu, K. Miyagawa, K. Kanoda
    • Journal Title

      Nature Physics 4

      Pages: 459-463

    • Related Report
      2008 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mott Transition in a Valence-Bond Solid Insulator with a Triangular Lattice2007

    • Author(s)
      Y. Shimizu, H. Akimoto, H. Tsujii, A. Tajima, R. Kato
    • Journal Title

      Physical Review Letters 99巻

      Pages: 256403-256403

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Reentrant Mott transition from a Fermi liquid to a spin-gapped insulator in an organic spin-1/2 triangular-lattice antiferromagnet2007

    • Author(s)
      Y. Shimizu, H. Akimoto, H. Tsujii, A. Tajima, and R. Kato
    • Journal Title

      J. Phys. : Condens. Matter 19巻

      Pages: 145240-145240

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Anomalous Pressure Dependence of Superconductivity in Layered Organic Conductor, κ-(BEDT-TTF)_4Hg_<2.89>Br_82007

    • Author(s)
      H. Taniguchi, T. Okuhata, T. Nagai, K. Satoh, N. Mori, Y. Shimizu, M. Hedo, Y. Uwatoko
    • Journal Title

      Journal of the Physical Society of Japan 76巻

      Pages: 113709-113709

    • Related Report
      2008 Final Research Report
    • Peer Reviewed
  • [Journal Article] Mott Transition in a Valence-Bond Solid Insulator with a Triangular Lattice2007

    • Author(s)
      Y. Shimizu, H. Akimoto, H. Tsujii, A. Tajima, R. Kato
    • Journal Title

      Physical Review Letters 99

      Pages: 2564031-2564034

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Reentrant Mott transition from a Fermi liquid to a spin-gapped insulator in anorganic spin-1/2 triangular-lattice antiferromagnet2007

    • Author(s)
      Y. Shimizu, H. Akimoto, H. Tsujii, A. Tajima, R. Kato
    • Journal Title

      Journal of Physics: Condensed Matter 19

      Pages: 1452401-1452405

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Anomalous Pressure Dependence of Superconductivity in Layered Organic Conductor, K-(BEDT-TTF)_4Hg_<2.89>Br_82007

    • Author(s)
      H. Taniguchi, T. Okuhata, T. Nagai, K. Satoh, N. Mori, Y. Shimizu, M. Hedo, Y. Uwatoko
    • Journal Title

      Journal of the Physical Society of Japan 76

      Pages: 113709-113712

    • Related Report
      2007 Annual Research Report
    • Peer Reviewed
  • [Presentation] ホーランダイトK_2V_8O_<16>の高圧下NMR2009

    • Author(s)
      清水康弘, 伊藤正行, 竹下直, 他
    • Organizer
      日本物理学会春季大会
    • Place of Presentation
      立教大学
    • Year and Date
      2009-03-27
    • Related Report
      2008 Annual Research Report
  • [Presentation] NMRでみた擬一次元フラストレーション系Ca_3Co_2O_6の磁性2009

    • Author(s)
      堀部宗尚, 高見剛, 清水康弘, 伊藤正行
    • Organizer
      2009年日本物理学会春季大会(第64回年次大会)
    • Place of Presentation
      立教大学
    • Related Report
      2008 Final Research Report
  • [Presentation] ホーランダイトK_2V_8O_<16>の高圧化NMR2009

    • Author(s)
      清水康弘, 伊藤正行, 竹下直, 磯部正彦,山内徹, 上田寛
    • Organizer
      2009年日本物理学会春季大会
    • Place of Presentation
      立教大学
    • Related Report
      2008 Final Research Report
  • [Presentation] マルチフェロイックNi_3V_2O_8のNMR測定2009

    • Author(s)
      江崎達郎, 高見剛, 清水康弘, 伊藤正行,何長振, 上田寛
    • Organizer
      2009年日本物理学会春季大会
    • Place of Presentation
      立教大学
    • Related Report
      2008 Final Research Report
  • [Presentation] 擬一次元伝導体β-Na_<0.33>V_2O_5の高圧物性2009

    • Author(s)
      鈴木泰輔, 山内一宏, 井上昌次, 清水康弘,伊藤正行, 竹下直, 山内徹, 上田寛
    • Organizer
      2009年日本物理学会春季大会
    • Place of Presentation
      立教大学
    • Related Report
      2008 Final Research Report
  • [Presentation] 単結晶NMRでみたLiV_2O_4の電子状態2009

    • Author(s)
      田中萌, 武田晃, 清水康弘, 伊藤正行, 新高誠司, 竹下直, 高木英典
    • Organizer
      2009年日本物理学会春季大会
    • Place of Presentation
      立教大学
    • Related Report
      2008 Final Research Report
  • [Presentation] Anisotropic Local Spin Suceptibility Probed by ^<51>V NMR in the Quasi- 1D Multiband Metal K_2V_8O_<16>2008

    • Author(s)
      Y. Shimizu, M. Itoh, K. Okai, M. Isobe, Y. Ueda
    • Organizer
      International Symposium on Anomalous Quantum Materials (ISAQM2008)
    • Place of Presentation
      Yasuda Auditorium, Univ. of Tokyo.
    • Related Report
      2008 Final Research Report
  • [Presentation] Phase diagram under high pressure in the quasi-one-dimensional superconductor β-Na_<0.33>V_2O_5 : NMR measurements2008

    • Author(s)
      M. Itoh, Y. Shimizu, T. Suzuki, I. Yamauchi, N. Takeshita, T. Yamauchi, Y. Ueda
    • Organizer
      International Symposium on Anomalous Quantum Materials (ISAQM2008)
    • Place of Presentation
      Yasuda Auditorium, Univ. of Tokyo.
    • Related Report
      2008 Final Research Report
  • [Presentation] 高圧NMR用ブリッジマンアンビルセルの改良とβ-Na0.33V2O5のNMR測定2008

    • Author(s)
      鈴木泰輔, 山内一宏, 井上晶次, 清水康弘, 伊藤正行, 竹下直, 山内徹, 上田寛
    • Organizer
      日本物理学会2008年秋季大会
    • Place of Presentation
      岩手大学
    • Related Report
      2008 Final Research Report
  • [Presentation] 重い電子系LiV2O4単結晶のNMR2008

    • Author(s)
      田中萌, 清水康弘, 伊藤正行, 新高誠司, 竹下直, 高木英典
    • Organizer
      日本物理学会 2008 年秋季大会
    • Place of Presentation
      岩手大学
    • Related Report
      2008 Final Research Report
  • [Presentation] α-(ET)_2I_3 の高圧^<13>C-NMR2008

    • Author(s)
      清水康弘, 小林晃人, 伊藤正行, 山本浩史, 鷹野芳樹, 高橋利宏
    • Organizer
      日本物理学会 2008 年秋季大会
    • Place of Presentation
      岩手大学
    • Related Report
      2008 Final Research Report
  • [Presentation] Microscopic Observation of the Spin-Singlet Cluster in the Frustrated Spinel AlV_2O_42008

    • Author(s)
      Y. Shimizu, M. Tanaka, M. Itoh, T. Katsufuji
    • Organizer
      25th International Conference on Low Temperature Physics
    • Place of Presentation
      Amsterdam
    • Related Report
      2008 Final Research Report
  • [Presentation] Metal-Insulator Transition in the Hollandite Vanadate K_2V_8O_<16> Investigated by ^<51>V NMR Measurements2008

    • Author(s)
      K. Okai, M. Itoh, Y. Shimizu, M. Isobe, J. Yamaura, Y. Ueda
    • Organizer
      25th International Conference on Low Temperature Physics
    • Place of Presentation
      Amsterdam
    • Related Report
      2008 Final Research Report
  • [Presentation] Spin Dynamics of the Frustrated Ferromagnetic-Chain System Ca_3Co_2O_62008

    • Author(s)
      H. Nanba, M. Horibe, T. Takami, Y. Shimizu, M. Itoh
    • Organizer
      25th International Conference on Low Temperature Physics
    • Place of Presentation
      Amsterdam
    • Related Report
      2008 Final Research Report
  • [Presentation] Local Spin Susceptibility in the Metallic Phase of the Quasi-One-Dimensional Conductor β-Li_<0.33>V_2O_52008

    • Author(s)
      I. Yamauchi, M. Itoh, Y. Shimizu, T. Yamauchi, Y. Ueda
    • Organizer
      25th International Conference on Low Temperature Physics
    • Place of Presentation
      Amsterdam
    • Related Report
      2008 Final Research Report
  • [Presentation] Spin Diffusion in the Quasi-One-Dimensional Conductor β-Na_<0.33>V_2O_52008

    • Author(s)
      I. Yamauchi, M. Itoh, Y. Shimizu, T. Yamauchi, Y. Ueda
    • Organizer
      25th International Conference on Low Temperature Physics
    • Place of Presentation
      Amsterdam
    • Related Report
      2008 Final Research Report
  • [Presentation] スピネル型酸化物AlV_2O_4のNMR II2008

    • Author(s)
      田中萌, 清水康弘, 伊藤正行, 勝藤拓郎
    • Organizer
      日本物理学会第63回年次大会
    • Place of Presentation
      近畿大学
    • Related Report
      2008 Final Research Report
  • [Presentation] 擬一次元導体β-Na_<0.33>V_2O_5におけるスピン拡散-^<51>V 核の核スピン-格子緩和率測定-2008

    • Author(s)
      山内一宏, 清水康弘, 伊藤正行, 山内徹, 山浦淳一, 上田寛
    • Organizer
      日本物理学会第63回年次大会
    • Place of Presentation
      近畿大学
    • Related Report
      2008 Final Research Report
  • [Presentation] 擬一次元超伝導体β-Na0.33V2O5の温度-圧力相図II-超高圧下のNMR測定-2008

    • Author(s)
      鈴木泰輔, 山内一宏, 清水康弘, 伊藤正行, 竹下直, 寺倉千恵子, 山内徹, 上田寛, 高木英典, 十倉好紀
    • Organizer
      日本物理学会第63回年次大会
    • Place of Presentation
      近畿大学
    • Related Report
      2008 Final Research Report
  • [Presentation] ホーランダイト型バナジウム酸化物K_2V_8O_<16>のNMR2008

    • Author(s)
      清水康弘, 岡井克典, 生駒毅, 伊藤正行, 礒部正彦, 上田寛
    • Organizer
      日本物理学会第63回年次大会
    • Place of Presentation
      近畿大学
    • Related Report
      2008 Final Research Report 2007 Annual Research Report
  • [Presentation] 擬一次元導体β-Na0.33V2O5の金属絶縁体転移と電子構造2007

    • Author(s)
      山内一宏, 清水康弘, 伊藤正行, 山内徹, 山浦淳一, 上田寛
    • Organizer
      2007年日本物理学会
    • Place of Presentation
      北海道大学
    • Related Report
      2008 Final Research Report
  • [Presentation] 擬一次元導体β-Na_<0.33>V_2O_5の金属絶縁体転移と電子構造2007

    • Author(s)
      山内一宏, 清水康弘, 伊藤正行, 山内徹, 山浦淳一, 上田寛
    • Organizer
      2007年日本物理学会
    • Place of Presentation
      北海道大学
    • Related Report
      2008 Final Research Report
  • [Presentation] 擬一次元超伝導体β-Na_<0.33>V_2O_5の温度-圧力相図-超高圧下のNMR測定-2007

    • Author(s)
      鈴木泰輔, 山内一宏, 清水康弘, 伊藤正行, 竹下直, 寺倉千恵子, 山内徹, 上田寛, 高木英典, 十倉好紀
    • Organizer
      2007年日本物理学会
    • Place of Presentation
      北海道大学
    • Related Report
      2008 Final Research Report
  • [Presentation] ホーランダイト型バナジウム酸化物K_2V_8O_<16>単結晶のNMR2007

    • Author(s)
      岡井克典, 清水康弘, 伊藤正行, 礒部正彦, 上田寛
    • Organizer
      2007年日本物理学会
    • Place of Presentation
      北海道大学
    • Related Report
      2008 Final Research Report
  • [Presentation] 1次元コバルト酸化物Ca_3Co_2O_6のNMR2007

    • Author(s)
      難波寛, 清水康弘, 伊藤正行
    • Organizer
      2007年日本物理学会
    • Place of Presentation
      北海道大学
    • Related Report
      2008 Final Research Report
  • [Presentation] スピネル型酸化物AlV_2O_4のNMR2007

    • Author(s)
      田中萌, 清水康弘, 伊藤正行, 勝藤拓郎
    • Organizer
      2007年日本物理学会
    • Place of Presentation
      北海道大学
    • Related Report
      2008 Final Research Report
  • [Remarks]

    • URL

      http://i-ken.phys.nagoya-u.ac.jp/

    • Related Report
      2008 Annual Research Report

URL: 

Published: 2007-04-01   Modified: 2020-05-15  

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