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Study of highly correlated materials

Research Project

Project/Area Number 06044135
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionOsaka University

Principal Investigator

ASAYAMA Kunisuke  Osaka Univ., Faculty of Eng. Sci., Prof., 基礎工学部, 教授 (20029416)

Co-Investigator(Kenkyū-buntansha) COQBLIN B.  Recherches au C.N.R.S., Orsay, Directer, ディレクター
BERTHIR C.  Lab. Spectrometrie Physique, Univ. J.F.Grenoble, Prof., 光学研究所・NMR部門, 主任研究員
STEGLICH F.  Technische Hochschule Darmstadt, Institut fur Festkorperphysik, Prof., 物理部, 教授
FLOUQUET J.  Center d'Etudes Nucleaires de Grenoble, Directer, 凝縮系部門, 部長
MAYAKE Kazumasa  Osaka Univ., Faculty of Eng. Sci., Prof., 基礎工学部, 教授 (90109265)
KATAOKA Yoshio  Osaka Univ., Faculty of Eng. Sci., Assoc. Prof., 基礎工学部, 助教授 (70110707)
FLOUGUET J.  グルノーブル原子核研究センター, 凝縮系部門, 部長
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥10,600,000 (Direct Cost: ¥10,600,000)
Fiscal Year 1995: ¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1994: ¥6,000,000 (Direct Cost: ¥6,000,000)
KeywordsNMR / Heavy Fermion / Superconductor / High Tc Cuprate / p-Wave / d-Wave / Spin Fluctuation / d波対 / 反強磁性 / URu_2Si_2 / UPd_2Al_3 / UNi_2Al_3
Research Abstract

Study of highly correlated materials, heavy fermion superconductors and high Tc cuprate superconductor were carried out in collaboration with French and German researchers.
The works in both sides are complementary to each other, that is, in Japan the investigations are mainly made by NMR technique, while in Europe, sample preparation, susceptibility, electric resistivily and specific heat measurements are performed.
In 1994 4 Japanese researches visited Europe, United States and Korea and in 1995 4 Japanese visited Europe, United states and India to make collaboration work, discussions, and to exchange and collect the informations.
On the other hand, we invited 2 French researchers in 1994 and 2 German and 2 French researchers in 1995 to make collaboration work and discussions, to exchange the information and to summarize the results.
The results are as following
The ground state in CeCu_2Si_2 is non-magnetic and d wave superconducting. With slight change of the atomic configuration, the superconductivity is easily destroyed and a magnetic order appears. The nature of this magnetic order is still not clear.
UPd_2Al_3 is a d-wave superconductor probably induced by antiferromagnetic spin fluctuations where the gap zero on line is realized as observed by NMR.The specific heat measurement shows as if the gap disappears on points. The discrepancy between these measurements are attributed to a pair breaking effect which produces point zero gap like behavior even in the line zero gap state.
UPt_3 is concluded to be a p-wave superconductor induced by ferromagnetic spin fluctuations.
NMR results in Tl_2Ba_2Ca_2Cu_3O_<10> and HgBa_2Ca_2Cu_3O_8 with highest Tc show that the antiferromagnetic spin fluctuation mediated mechanism is the most promising model for the occurrence of the high Tc superconductivity.

Report

(2 results)
  • 1995 Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (20 results)

All Other

All Publications (20 results)

  • [Publications] Y.Kitaoka et al.: "NMR study of strongly correlated electron systems" Physica B. 206-207. 55-61 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Tou et al.: "d-wave Superconductivity in Antiferromagnetic Heavy-Fermion Compound UPd_2Al_3…Evidence from ^<27>Al NMR/NQR Studies…" J.Phys.Soc.Jpn.64. 725-729 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] G.-q.Zheng et al.: "Local Hole Distribution in the CuO_2 Plane of High-Tc Cu-Oxides Studied by Cu and Oxygen NQR/NMR" J.Phys.Soc.Jpn.64. 2524-2532 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] G.-q.Zheng et al.: "Characteristics of the Spin Fluctuation in Tl_2Ba_2Ca_2Cu_3O_<10>" J.Phys.Soc.Jpn.64. 3184-3187 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Kitaoka et al.: "NMR study in Novel Superconductors : Heavy Fermion System and High-Tc Cuprate" J.Phys.Chem.Solids. 56. 1931-1935 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Magishi et al.: "Spin Correlation in High Tc Cuprate HgBa_2Ca_2Cu_3O_<8+δ> with Tc=133K…An Origin of Tc-Enhancement Evidenced by ^<63>Cu-NMR Study…" J.Phys.Soc.Jpn.64. 4561-4565 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Asayama et al: "NMR studies of high Tc Superconductors" J.Progress in Nuclear Magnetic Spectroscopy. 印刷中. (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Ishida et al.: "Spin Correlation and Spin Gap in Quasi One-Dimensional Spin-1/2 Cuprate Oxides : A ^<63>Cu NMR" Phys.Rev.B. 53. 2827-2834 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Tou et al.: "Odd parity superconductivity with equal spin pairing in UPt_3" Phys.Rev.Lett. (投稿中). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Kitaoka et al.: "NMR study of strongly correlated electron systems" Physica B. 206-207. 55-61 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Tou et al.: "d-wave Superconductivity in Antiferromagnetic Heavy-Fermion Compound UPd_2Al_3 -Evidence from^<27>Al NMR/NQR Studies-" J.Phy. Soc. Jpn.64. 725-729 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] G.-q. Zheng et al.: "Local Hole Distribution in the CuO_2 Plane of High-Tc Cu-Oxides Studied by Cu and Oxygen NQR/NMR" J.Phy. Soc. Jpn.64. 2524-2532 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] G.-q. Zheng et al.: "Characteristics of the Spin Fluctuation in Tl_2Ba_2Ca_2O_<10>" J.Phy. Soc. Jpn.64. 3184-3187 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Kitaoka et al.: "NMR Study in Novel Superconductors : Heavy Fermion System and High-Tc Cuprate" J.Phys. Chem. Solids.56. 1931-1935 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Magishi et al.: "Spin Correlation in High Tc Cuprate HgBa2Ca2Cu08+ with Tc=133K -An Origin of Tc-Enhancement Evidenced by 63Cu-NMR Study-" J.Phy. Soc. Jpn.64. 4561-4565 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Asayama et al.: "NMR Studies of High Tc Superconductors" J.Progress in Nuclear Magnetic Spectroscopy. (to be published). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] K.Ishida et al.: "Spin Correlation and Spin Gap in Quasi One-Dimensional Spin-1/2 Cuprate Oxides : A^<63>Cu NMR" Phys. Rev. B. 53. 2827-2834 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Tou et al.: "Odd parity superconductivity with equal spin pairing in UPt_3" Phys. Rev. Lett.(to be published). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Y.Kitaoka,et al.: "NMR study of strongly correlated electron systems" Physica B. (印刷中). (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] H.Tou,et al.: "D-wave Superconductivity in Antiferromagnetic Heavy-Fermion Compound UPdP_2Al_3--Evidence from ^<27>Al NMR/NQR Studies--" J.Phys.Soc.Jpn.64(印刷中). (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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