Weak localization effects on the upper critical field of bulk superconductors.
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Weak localization effects on bulk superconductivity are investigated by measuring the upper critical field (Hc2) and the heat capacity (C) on the same sample of a given alloy composition. Systems studied include rapidly solidified glassy Zr70Ni30, Zr75Rh25, and body-centered cubic Hf90Mo10. The homogeneity of samples are examined. Without including quantum corrections, very good fits to the Hc2 curves predicted by the classical theory of dirty superconductors are obtained by varying the Pauli paramagnetic limiting and spin-orbit scattering parameters. However, the initial gradients obtained from fitting the Hc2 data are (1030)% higher than those determined by the N*(0) products [ is the electrical resistivity and N*(0) is the density of states obtained from heat-capacity measurements]. These relative enhancements of the upper critical fields are attributed to field-induced delocalization effects. The results are analyzed in the framework of the Fukuyama, Ebisawa, and Maekawa theory of weak localization. 1987 The American Physical Society.
Phys Rev B Condens Matter
author list (cited authors)
Wong, K. M., Poon, S. J., Lambrecht, A., & Naugle, D. G.
complete list of authors
Wong, KM||Poon, SJ||Lambrecht, A||Naugle, DG