195Pt NMR study of the heavy fermion superconductor UPt3

Abstract In the superconducting state, T -1 1 of 195 Pt has no enhancement just below T c and varies as T 3 at low temperatures. This indicates the existence of an anisotropic superconducting energy gap which vanishes at lines on the Fermi surface. The Knight shift data show that the conduction electron spin susceptibility does not decrease below T c .