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Search for Novel Superconductors with High-Tc in the Ru Oxide System and Possibility for Coexistence of Magnetism and Superconductivity

Research Project

Project/Area Number 12440195
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 機能・物性・材料
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

YOSHIMURA Kazuyoshi  Kyoto Univ., Graduate School of Sci., Prof, 大学院・理学研究科, 教授 (70191640)

Co-Investigator(Kenkyū-buntansha) KATO Masaki  Kyoto Univ., Graduate School of Sci., Instructor, 大学院・理学研究科, 助手 (90271006)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥15,200,000 (Direct Cost: ¥15,200,000)
Fiscal Year 2002: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2001: ¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 2000: ¥9,800,000 (Direct Cost: ¥9,800,000)
KeywordsRu Oxide / 4d-5d electron system / Oxide Superconductor / Metal-Insulator Transition / Strong Electron Correlation / Low Dimensional Magnetism / Perovskite / Pyrochlore / 層状ペロブスカイト / 4d・5d遷移金属酸化物 / 磁性と超伝導 / クーパー対の対称性 / 高温超伝導 / 核磁気共鳴・緩和 / 4d遷移金属 / p波超伝導 / 核磁気共鳴 / 核磁気緩和
Research Abstract

It is quite important to find out new compounds which show new physical properties, leading to a possible breakthrough in the field of solid state sciences. In this context, the role of chemists is very important in this research field.
We have investigated the syntheses and chemical and physical properties of various 4d and 5d transition metal oxide systems, and tried to find new and novel compounds which show new-type of quantum phenomena, especially, superconducting and metal-insulator transition compounds.
As a result, recently, the Pyrochlore oxide Cd_2Re_2O_7 has been found to exhibit superconductivity at about 1 K, which is a firstly-found superconductor in the frustrated-spin system. We also found a pseudo-gap behavior in Cd_2Re_2O_7 below T^* of about 200K which resembles the spin-gap behavior in the cuprate high-T_c systems.
We have also found new-type compounds with interesting physical and chemical properties in this research program as follows: EuSr_2RuCu_2O_8 (coexistence of ferromagnetism and superconductivity), Tl_2Ru_2O_7 (Metal-Insulator transition and spin-gap behavior below T_<M-1>), Bi_2Ru_2O_7 and Pb_2Ru_2O_7 (Pauli paramagnetism with antiferromagnetic spin fluctuations). Now, further study of physical properties of these compounds including spin dynamics is still in progress in detail, and will be reported elsewhere.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (30 results)

All Other

All Publications (30 results)

  • [Publications] H.Sakai: "Superconductivity in pyrochlore oxide Cd_2Re_2O_7"Physica C. 378-381. 43-46 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Yokoyama: "Cu NQR study of Hole Doped 1-D Cu Chain Oxide Ca_<0.85>CuO_2"J. Phys. Chem. Solids. 63. 1111-1114 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T.Waki: "^<51>V NMR Study of the V Hollandite system, Bi_xV_8O_<16> : spin-singlet formation below M-I transition"J. Phys. Soc. Jpn.. 71. 160-162 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Sakai: "Low-temperature structural change and magnetic anomaly in superconduction Cd_2Re_2O_7"Phys. Rev. B. 66. 100509-1-100509-4 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Sakurai: "Antiferromagnetic Order in Bi_4Cu_3V_2O_<14> with Novel Spin Chain"J. Phys. Soc. Jpn.. 71. 1161-1165 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Sakai: "^<99,101>Ru NMR Study of EuSr_2RuCu_2O_8"Physica C. 378-381. 399-403 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Sakai, H. Ohno, K. Yoshimura, H. Kato, S. Kambe, R. E. Walstedt, T. D. Matsuda, Y. Haga, S. Ikeda and Y. Onuki: "Superconductivity in pyrochlore oxide Cd_2Re_2O_7"Physica C. 378-381. 43-46 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Yokoyama, T. Mitsui, M. Kato and K. Yoshimura: "Cu NQR study of Hole Doped 1-D Cu Chain Oxide Ca_<0.85>CuO_2"J Phys. Chem. Solids. 63. 1111-1114 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] T. Waki, H. Kato, M. Kato and K. Yoshimura: "^<51>V NMR Study of the V Hollandite system, Bi_xV_8O_<16>: spin-singlet formation below M-I transition"J. Phys. Soc, Jpn.. 71. 160-162 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Sakai, H. Kato, S. Kambe, R. E. Walstedt, H. Ohno, M. Kato, K. Yoshimura and H. Matsuhata: "Low-temperature structural change and magnetic anomaly in superconduction Cd_2Re_2O_7"Phys. Rev. B. 66. 100509-1-4 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Sakurai, K. Yoshimura, K. Kosuge, N. Tsujii, H. Abe, H. Kitazawa, G. Kido, H. Michor and G. Hilscher: "Antiferromagnetic Order in Bi_4Cu_3V_2O_<14> with Novel Spin Chain"J. Phys. Soc. Jpn,. 71. 1161-1165 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H. Sakai, N. Osawa, K. Yoshimura, M. Fang and K. Kosuge: "^<99,101>Ru NMR Study of EuSr_2RuCu_2O_8"Physica C. 378-381. 399-403 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] H.Sakai: "Superconductivity in pyrochlore oxide Cd_2Re_2O_7"Physica C. 378-381. 43-46 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Yokoyama: "Cu NQR study of Hole Doped 1-D Cu Chain Oxide Ca_<0.85>CuO_2"J. Phys. Chem. Solids. 63. 1111-1114 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] T.Waki: "^<51>V NMR Study of the V Hollandite system, Bi_xV_8O_<16> : spin-singlet formation below M-I transition"J. Phys. Soc. Jpn.. 71. 160-162 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Sakurai: "Spin-Singlet State of A_2CuB_2O_6 (A=Sr, Ba) with a Layered Structure"J. Phys. Soc. Jpn.. 71. 999-1000 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Sakurai: "Antiferromagnetic Order in Bi_4Cu_3V_2O_<14> with Novel Spin Chain"J. Phys. Soc. Jpn.. 71. 1161-1165 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Sakai: "^<99,101>Ru NMR Study of EuSr_2RuCu_2O_8"Physica C. 378-381. 399-403 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] H.Kato: "Temperature Induced Metal Insulator Transition in Bi_xV_8O_<16>"J.Phys.Soc.Jpn.. 70(2). 325-328 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Niitaka: "High-Field Magnetization and Neutron Diffraction Studies of One-Dimensional Compound Ca_3CoRhO_6"J.Phys.Soc.Jpn.. 70(5). 1222-1225 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Kato: "^<23>Na-NMR Study in NaV_6O_<11>"J.Phys.Soc.Jpn.. 70(5). 1404-1410 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Sakai: "Superconductivity in a pyrochlore oxide, Cd_2Re_2O_7"J.Phys. : Condens.Mat.. 13. L785-L790 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] S.Niitaka: "Partially Disordered Antiferromagnetic Phase in Ca_3CoRhO_6"Phys.Rev.Lett.. 87(17). 177202-1-177202-4 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Sakai: "STl-NMR Study of Pyrochlore Oxide Tl_2Ru_2O_7 : Observation of Spin-Singlet Formation"J.Phys.Soc.Jpn.. 71(2). 422-424 (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] H.Kato: "Temperature Induced Metal Insulator Transition in Bi_xV_8O_<16>"J. Phys. Soc. Jpn.. 70(2). 325-328 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] A.Irizawa: "Collapse of Superconductivity in the Y123/Y124 Superlattice System Y_2Ba_4Cu_7O_<15-δ>"J. Phys. Soc. Jpn.. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Kato: "^<23>Na-NMR Study in NaV_6O_<11>"J. Phys. Soc. Jpn.. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] M.Fang: "Itinerant-Electron Ferromagnetism and Superconductivity in EuSr_2Ru_<1-x>Nb_xCu_2O_8"Phys. Rev. B. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] H.Kato: "Structural and magnetic phase transitions of AV_6O_<11> (A=Na, Sr, and Pb)"Phys. Rev. B. (in press). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] K.Yoshimura: "Systematic composition dependence in YbCu_5-xAux from dense Kondo to antiferromagnetic system through quantum critical point around x=0.2-0.4"J. Alloy. Com.. (in press). (2001)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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