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The nuclear magnetic relaxation rate, 1/ T 1 , of 195 Pt in a normal and superconducting state was measured. In the normal state, 1/ T 1 is proportional to T , indicating the Fermi liquid nature of the system. In the superconducting state, 1/ T 1 has no enhancement just below the transition temperature and varies in proportion to T 3 at low temperatures. These results indicate the existence of an anisotropic superconducting energy gap, which vanishes at lines on the Fermi surface.
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Kohori et al. (1988) studied this question.
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