Nuclear Magnetic Resonance in Heavy Fermion Superconductor : II. Intermetallic Compounds and Other Inorganics :

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  • Y,Kitaoka
    Department of Material Physlcs, Faculty of Engineering Science, Osaka University
  • K,Ueda
    Basic Research Laboratory, Himeji Institute of Technology
  • Y,Kohori
    Department of Material Physlcs, Faculty of Engineering Science, Osaka University
  • T,Kohara
    Basic Research Laboratory, Himeji Institute of Technology
  • K,Asayama
    Department of Material Physlcs, Faculty of Engineering Science, Osaka University

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Abstract

NMR measurements of Cu, Si and Pt ln heavy electron systems, CeCu_2Si_2, UPt_3 and URu_2Si_2 have been performed. T_1^<-1>'s in all systems show no enhancement just below T_c and decrease in proportion to T^3 at low temperature. This behavior suggests that the superconducting energy gap is anisotropic disappearing on lines at the Fermi surface. The Knight shift decreases rapidly below T_c in CeCu_2Si_2, indicating the singlet nature of Cooper pair. Thus the pairing function of d wave is concluded to be realized in CeCu_2Si_2.For UPt_3 and URu_2Si_2, the Knight shift does not decrease below T_c. For these compounds we cannot give decisive conclusion about the nature of the pairing(p wave or d wave)at present though odd parity pairing is more likely in UPt_3.

Journal

  • JJAP series

    JJAP series 1 104-107, 1988-05-10

    Japanese Journal of Applied Physics

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