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^<13>C NMR in borocarbide superconductor

Research Project

Project/Area Number 08640464
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 InstitutionThe University of Tokushima

Principal Investigator

MIZUNO Kiyoshi  Faculty of Arts and Sciences The University of Tokushima Professor, 総合科学部, 教授 (40087094)

Co-Investigator(Kenkyū-buntansha) SAITO Takahito  Faculty of Arts and Sciences The University of Tokushima Research Associate, 総合科学部, 助手 (60201505)
KOYAMA Kuniyuki  Faculty of Arts and Sciences The University of Tokushima Associate Professor, 総合科学部, 助教授 (40170394)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1997: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1996: ¥1,400,000 (Direct Cost: ¥1,400,000)
Keywordssuperconductivity / spin fluctuation / electron-electron correlation / borocarbide / NMR / spin-lattice relaxation time / BCS / BCS / ボロカ-バイド超伝導体
Research Abstract

Quaternary borocarbide intermetallic compounds RM_2B_2C (R = rare-earth element, M=transition metal element) show a relatively high superconducting transition temperature T_c The effect of electron correlation is expected to be important because the d-electron of transition metal plays a leading actor of conduction. From ^<13>C,^<11>B NMR,the detailed information on the electronic properties of borocarbide superconductor YNi_2B_2C is obtained in normal and superconducting state.
1. In the normal state, the existence of the antiferromagnetic spin fluctuation was suggested. The spin-lattice relaxation rate T_1^<-1> and Knight shift K of ^<13>C and ^<11>B NMR show that the isotropic (Fermi contact) interaction between 2s conduction electron spin and nuclear spin at the carbon site and the boron site is dominant. The temperature dependences of T_1^<-1> and K is explained well by the Korringa mechanism. These temperature dependences are attributed to that of spin susceptibility, which is the consequence of band structure. No antiferromagnetic spin fluctuation is observed in ^<13>C and ^<11>B NMR.Strength of the electro-electron interaction is the same order as that found in alkali metal. These experimental results agree well with the results of band calculation.
2. In the superconducting state, a small coherence (Hebel-Slichter) peak is obsereved, which testified the borocarbide compounds to be a conventional phonon-mediated s wave (BCS) superconductors. From the temperature dependence of <@D113@>D1CT<@D21@>D2<@D1-1@>D1, a superconducting gap parameter of 2DELTA<@D20@>D2/k<@D2B@>D2T<@D2C@>D2 = 3.30(]SY.+-。[)0.08 is obtained. The borocarbide compound being a conventional BCS superconductor is consistent with the normal properties of the Fermi liquid picture in the normal state.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (32 results)

All Other

All Publications (32 results)

  • [Publications] 斎藤 隆仁: "^<13>C NMR in YNi_2B_2C" Czechoslovak Journal of Physics. 46,Suppl.S2. 835-836 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小山 晋之: "High Pressure Synthesis and Magnetic Propeties of Cu Containing Oxide Tm-Ca-Cu-O" Natural Science Research,Faculty of Integrated Arts and Sciences,The University of Tokushima. 9. 11-22 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小山 晋之: "Oxygen concentration depenednce of superconductivity in Pr-substituted Ln_<1-x>Pr_xBa_2Cu_3O_<7-y>(Ln=Y,Nd,Gd)" Physica C. 263. 336-339 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 小山 晋之: "Oxygen concentration depenednce of superconductivity in Ln_<1-x>Pr_xBa_2Cu_3O_<7-y>(Ln=Nd,Gd,Ho,Y,Yb)" Czechoslovak Journal of Physics. 46,Suppl.S2. 1445-1446 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 明神 教久: "Spin Reorientation Phenomena in (R_<1-x>R′_x)_2Co_<14>B Compounds" Verlag der Zeitshrift fur Naturaforschung. 51a. 726-727 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大野 隆: "Cu(1)NQR in Y_<1-x>Pr_xBa_2Cu_3O_7" Verlag der Zeitshrift fur Naturaforschung. 51a. 797-800 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大野 隆: "Cu NQR and hole transfer in R_<1-x>Pr_xBa_2Cu_3O_<7-y>" Physica B. 237-238. 100-102 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 斎藤 隆仁: "^<13>C NMR study of borocarbide superconductor YNi_2B_2C" Journal of Magnetism and Magnetic Materials. (印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大野 隆: "Changes in the on-site holes of plane site Cu(2)and chain site Cu(1)in Pr doped Y_<1-x>Pr_xBa_2Cu_3O_<7-δ>" Journal of Magnetism and Magnetic Materials. (印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 山雄 健史: "Nonlinear Electric Response of YBa_2Cu_4O_3 Ceramics at the Inter-Grain Superconductive Transition" Journal of Magnetism and Magnetic Materials. (印刷中). (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 斎藤 隆仁: "NMR Study on Carbon-containing Inorganic Superconductors" 東京都立大学 博士(理学)学位論文(博士論文)., 122 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Saito, K.Mizuno, K.Koyama, K.Endo: "^<13>C NMR in YNi_2B_2C" Czechoslovak Journal of Phsyics. 46, Suppl.S2. 835-836 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Koyama, T.Ohno, O.Ohtaka, T.Hihara, S.Konishi, Y.Kitamura and K.Mizuno: "High Pressure Synthesis and Magnetic Properties of Cu Containing Oxide Tm-Ca-Cu-O" Natural Science Research, Faculty of Integrated Arts and Sciences, The University of Tokushima. 9. 11-22 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Koyama, T.Tange, Y.Kitamura, T.Saito, K.Mizuno: "Oxygen concentration dependence of superconductivity in Pr-substituted Ln_<1-x>Pr_xBa_2Cu_3O_<7-y> (Ln=Y,Nd, Gd)" Physica C. 263. 336-339 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Koyama, K.Mizuno, T.Saito, T.Tange, Y.Kitamura: "Oxygen concentration dependence of superconductivity in Ln_<1-x>Pr_xBa_2Cu_3O_<7-y> (Ln=Nd, Gd, Ho, Y.Yb)" Czechoslovak Journal of Physics. 46, Supple.S2. 1445-1446 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Myojin, T.Ohno, K.Mizuno, A.Tsujimura, K.Kojima: "Spin Reorientation Phenomena in (R_<1-x>R'_x) _2 Co_<14>B Compounds" Verlag der Zeitshrift fur Naturaforschung. 51a. 726-727 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Ohno, H.Nishihara, K.Koyama, H.Yasuoka: "Cu (1) NQR in Y_<1-x>Pr_xBa_2Cu_3O_7" Verlag der Zeitshrift fur Naturaforschung. 51a. 797-800 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Ohno, K.Koyama, H.Yasuoka: "Cu NQR and hole Transfer in Y_<1-x>Pr_xBa_2Cu_3O_<7-y>" Physica B. 237-238. 100-102 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Saito, N.Oka, K.Koyama, K.Mizuno, K.Endo, H.Deguchi: "^<13>C NMR study of borocarbide superconductor YNi_2B_2C" Journal of Magnetism and Magnetic materials. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Ohno, K.Koyama, H.Yasuoka: "Changes in the on-site holes of plane site Cu (2) and chain site Cu (1) in Pr doped Y_<1-x>Pr_xBa_2Cu_3O_<7-delta>" Journal of Magnetism and Magnetic Materials. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Yamao, M.Hagiwara, M.Matsuura, K.Koyama: "Nonlinear Electric Response of YBa_2Cu_4O_<7-delta> Ceramics at the Inter-Grain Superconductive Transition" Journal of Magnetism and Magnetic Materials. (in press). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] T.Saito: Dissertation for a Degree of Doctor of Science ; Tokyo Metropolitan University. NMR Study on Carbon-containing Inorganic Superconductors, 1-122 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] 大野 隆: "Cu NQR and hole transfer in R_<1-x>Pr_xBa_2Cu_3O_<7-y>" Physica B. 237-238. 100-102 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 齊藤 隆仁: "^<13>C NMR study of borocarbide superconductor YNi_2B_2C" Journal of Magnetism and Magnetic Materials. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 大野 隆: "Changes in the on-site holes of plane site Cu(2)and chain site Cu(1)in Pr doped Y_<1-x>Pr_xBa_2Cu_3O_<7-δ>" Journal of Magnetism and Magnetic Materials. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 山雄 健史: "Nonlinear Electric Response of YBa_2Cu_4O_8 Ceramics at the Inter-Grain Superconductive Transition" Journal of Magnetism and Magnetic Materials. (印刷中). (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 齊藤 隆仁: "NMR Study on Carbon-containing Inorganic Superconductors" 東京都立大学 博士(理学)学位論文(博士論文), 122 (1998)

    • Related Report
      1997 Annual Research Report
  • [Publications] 斉藤 隆仁: "^<13>C NMR in YNi_2B_2C" Czechoslovak Journal of Physics. 46. 835-836 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 小山 晋之: "Oxygen Concentration Dependence of Superconductivity in Pr-Substituted Ln_<1-x>Pr_xBa_2Cu_3O_<7-y>" Physica C. 263. 336-339 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 小山 晋之: "Oxygen Concentration Dependence of Superconductivity in Ln_<1-x>Pr_xBa_2Cu_3O_<7-y>(Ln=Nd,Gd,Ho,Y,Yb)" Czechoslovak Journal of Physics. 46. 1445-1446 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 明神 教久: "Spin Reorientation Phenomena in (R_<1-x>R′_x)_2Co_<14>B Compunds" Z.Naturforsch.51a. 726-730 (1996)

    • Related Report
      1996 Annual Research Report
  • [Publications] 小山 晋之: "Magnetic Properties of High-Pressure Synthesized Tm-Ca-Cu-O" Physica B. (印刷中). (1997)

    • Related Report
      1996 Annual Research Report

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Published: 1996-04-01   Modified: 2020-05-15  

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