Abstract
Measurements of the low-temperature specific heat of the pure metal and dilute nonmagnetic alloys of Al, Cd, and Zn are described. The washing out of the energy gap anisotropy with increasing impurity as predicted by Anderson was observed in aluminum-magnesium alloys, and the mean-squared anisotropy parameter 〈a 2〉 was measured to be 〈a 2〉⋍0.010. Values deduced from measurements on Zn and Cd and their corresponding alloys with 1≲ξ0 gave 〈a 2〉⋍0.02 for Zn and 〈a 2〉⋍0.05 for Cd. Values of the gaps determined by fitting to a two-gap model are given and compared to those deduced from previous work.
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