Suppression of Superconductivity in UPt3 Single Crystals
J. B. Kycia, J. I. Hong, M. J. Graf, J. A. Sauls, D. N. Seidman, W. P. Halperin
Abstract
High quality single crystals of UPt3 have been prepared by vertical float-zone refining in ultra-high vacuum. We find that the superconducting transition temperature can be varied systematically by annealing, revealing that the transition temperature intrinsic to UPt3 is 563 +/- 5 mK. The suppression of the superconducting transition from defects is consistent with a modified Abrikosov-Gor'kov formula that includes anisotropic pairing, Fermi surface anisotropy, and anisotropic scattering by defects.
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