The low temperature electrical resistivity of high purity Ag and Ag based alloys

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Abstract
High resolution measurements have been made of the electrical resistivity of Ag and alloys of Ag with Au, Pd and Pt, over the temperature range 2K-20K. The samples had all been freed of Fe contamination, and their residual resistivities ranged from 1 n Omega cm to 1 mu Omega cm. Below 10K all samples showed an almost pure T4 temperature dependence. Breakdown of Matthiessen's rule was severe at all temperatures, for example at 4.2K the samples showed a temperature dependent part of the resistivity that varied by a factor of ten. Neither the temperature dependence nor the departures from Matthiessen's rule appear to be explicable in terms of currently accepted theories.