Thermal Conductivity of Superconducting Th and Th-Gd Alloys

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Abstract
Thermal conductivity measurements are reported for both the normal and superconducting states of pure Th and Th-Gd alloys. The pure Th results show significant deviations from the Bardeen-Rickayzen-Tewordt theory, but these deviations are consistent with the observed anisotropy of the energy gap. Measurements for the Th-Gd alloys agree well with the theory of Ambegaokar and Griffin for paramagnetic-impurity-doped superconductors.