NMR Studies of Antiferromagnetic Superconductors URu_2Si_2 and Upd_2Al_3 :

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  • KOHORI,Yoh
    Department of Material Science, Faculty of Science, Himeji Institute of Technology
  • MATSUDA,Kazuyuki
    Department of Material Science, Faculty of Science, Himeji Institute of Technology
  • KOHARA,Takao
    Department of Material Science, Faculty of Science, Himeji Institute of Technology

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抄録

We have carried out NMR measurements of 29Si, ^<99,101>Ru, ^<27>Al and ^<105>Pd in the antiferromagnetic superconductors Uru_2Si_2 and Upd_2Al_3. No broadening of ^<29>Si and ^<99,101>Ru resonance lines associated with antiferromagnetic order (T_N = 17.5K) was observed in Uru_2Si_2. On the contrary, the splitting of ^<105>Pd - NQR line, which reflects on the appearance of internal field, occurs below T_N = 14.5K in UPd_2Al_3. In both systems, the nuclear spin-lattice relaxation rate 1/T_1 has no Hebel-Slichter coherence peak below the superconducting transition temperature T_c and the power law temperature T dependence (T^3) at lower temperatures, which indicates occurrence of the anisotropic non-s wave superconductivity having line nodes in the superconducting energy gap.

収録刊行物

  • JJAP series

    JJAP series 11 65-67, 1999-02-08

    Japanese Journal of Applied Physics

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