Abstract
The effect of Gd and Ni impurities on the upper superconducting transition temperature of UPt 3 ( T c + = 0.55 K) has been studied by means of resistivity measurements. Surprisingly, we find that paramagnetic Gd impurities suppress T c + at the same rate as non-magnetic Y or Th impurities, yielding further support for non-s-wave pairing. Ni impurities also suppress T c +, but do not dissolve homogeneously in the UPt 3 matrix.
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