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NMR Studies of the magnetic order in the Oxide High-Tc Superconductor

Research Project

Project/Area Number 07640486
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体物性Ⅱ(磁性・金属・低温)
Research InstitutionUniversity of the Ryukyus

Principal Investigator

NIKI Haruo  University of the Ryukyus, College of Science, Professor, 理学部, 教授 (80145549)

Co-Investigator(Kenkyū-buntansha) NAKAMA Takao  University of the Ryukyus, College of Science, Assistant Professor, 理学部, 講師 (80264472)
YAGASAKI Kastuma  University of the Ryukyus, College of Science, Professor, 理学部, 教授 (70045037)
Project Period (FY) 1995 – 1996
Project Status Completed (Fiscal Year 1996)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1996: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1995: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsOxide High-TC Superconductor / Antiferromagnetic Materials / NMR / NQR / Spin-Lattice Relaxation Time / Spin-Spin Relaxation Time
Research Abstract

Cu (1) NQR,Cu (2) zero field NMR,and Proton NMR have been measured in the antiferromagnetic phase of powdered samples of hydrogen-doped tetragonal YBa_2Cu_3O_<6+x>H_y from 4.2 to 300 K.Four samples with different concentration types of oxygen and hydrogen atoms (x, y), which are (0.07,0.118), , (0.1,0.14), (0.11,0.078), and (0.17,0.01), were used. The line width of ^1H NMR increases abruptly below 20 K.The enhancements of T_2^<-1> and T_1^<-1> of ^<63>Cu (1) NQR occur around 20 and 40 K,respectively. The relaxation mechanism of T_1 of ^<63>Cu (1) NQR changes at T_m=about 80 K and the time dependence of its magnetization recovery shows a nonexponential type for T < T_m and an exponential one for T > T_m. The predominant origin for T_1 below T_m is found to be the fluctuating magnetic fields due to the staggered Cu^<2+> moments on the Cu (1) or Cu (2) site induced by the hole doping effect. Above T_m, T_1^<-1> of ^<63>Cu (1) NQR increases gradually with temperature but it is almost temperature independent above 150 K,what can not be explained by the effect of the ordered AF Cu^<2+> moments in the Cu (2) O_2 plane and also by the Raman process of the lattice vibrations.

Report

(3 results)
  • 1996 Annual Research Report   Final Research Report Summary
  • 1995 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] Haruo Niki: "Nuclear relaxation of Hydrogen-doped Antiferromagnetic YBa_2Cu_3O_<6+x>H_y" J.Phys.Soc.Jpn.66(印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Haruo Niki: "A pulsed ^<35>Cl NQR Sutdy on Molecular Motion and Phase Transition of 4-Chlorobenzyl Alcohol" Zeitschrift fur Naturforschung. 51a. 731-735 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 二木治雄: "強相関系物質のNMR" 東北大学金属材料研究所新素材開発施設共同利用研究報告書. 6. 193-196 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 二木治雄: "強相関系物質のNMRとNQRによる研究" 東北大学金属材料研究所新素材開発施設共同利用研究報告書. 7. 118-120 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] 二木治雄: "酸化物高温超伝導体の磁気秩序のNMRによる研究" 東北大学金属材料研究所新素材開発施設共同利用研究報告書. 8(印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Haruo Niki: "Nuclear relaxation of Hydrogen-doped Antiferromagnetic YBa2Cu3O6+xHy" J.Phys. Soc. Jpn. 66 (to be published). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Haruo Niki: "NMR Study on the Magnetic Order of the Antiferromagnetic Phase of Oxide High-Tc Superconductor" Research Report of Laboratory of Materials Influenced for Development Research of Advanced Materials, the Institute for Materials Research, Tohoku University. 8 (to be published). (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Haruo Niki: "A pulsed ^<35>Cl NQR Study on Molecular Motion and Phase Transition of 4-Chlorobenzyl Alcohol" Zeitschrift fur Naturforschung. 51a. 731-735 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Haruo Niki: "NMR and NQR Studies of Materials Influenced on Strong Correlations between Electrons (Y NMR of YCu_2)" Research Report of Laboratory for Development Research of Advanced Materials, the Institute for Materials Research, Tohoku University. 7. 118-120 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Haruo Niki: "NMR and NQR Studies of Materials Influenced on Strong Correlations between Electrons (NMR and NQR studies on the Antiferromagnetic Phase of Oxide High-Tc Superconductor)" Research Report of Laboratory for Development Research of Advanced Materials, the Institute for Materials Research, Tohoku University. 6. 193-196 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1996 Final Research Report Summary
  • [Publications] Haruo Niki: "Nuclear relaxation of Hydrogen-doped Antiferromagnetic YBa_2Cu_3O_<6+x>H_y" J.Phys.Soc.Jpn.66. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Haruo Niki: "A pulsed ^<35>Cl NQR Sutdy on Molecular Motion and Phase Transition of 4-Chlorobenzyl Alcohol" Zeitschrift fur Naturforschung. 51a. 731-735 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 二木治雄: "強相関系物質のNMR" 東北大学金属研究所新素材開発施設共同利用研究報告書. 6. 193-196 (1995)

    • Related Report
      1996 Annual Research Report
  • [Publications] 二木治雄: "強相関系物質のNMRとNQRによる研究" 東北大学金属研究所新素材開発施設共同利用研究報告書. 7. 118-120 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 二木治雄: "酸化物高温超伝導体の磁気秩序のNMRによる研究" 東北大学金属研究所新素材開発施設共同利用研究報告書. 8. (1997)

    • Related Report
      1996 Annual Research Report
  • [Publications] Haruo Niki: "Nuclear relaxation of Hydrogen-doped Antiferromagnetic YBa_2Cu_3O_<6+X>H_y" Zaitschrift fur Naturforschung. 51a. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] Haruo Niki: "A pulsed ^<35>Cl NQR Sutdy on Molecular Motion and Phase Transition of 4-Chlorobenzyl Alcohol" Zaitschrift fur Naturforschung. 51a. (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 二木治雄: "強相関系物質のNMR" 東北大学金属研究所新素材開発施設共同利用研究報告書. 6. 193-196 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 二木治雄: "強相関系物質のNMRとNQRによる研究" 東北大学金属研究所新素材開発施設共同利用研究報告書. 7. (1996)

    • Related Report
      1995 Annual Research Report

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Published: 1995-04-01   Modified: 2020-05-15  

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