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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

cond-mat.supr-conarXiv:cond-mat/9806266

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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