Abstract
The electrical resistivity of a number of Pd-Rh, Pd-Ru, and Pd-Ag alloys has been measured from about 1K to room temperature, and, in two specimens of Pd-Pt, at temperatures below about 12K. Shallow resistance minima are observed between about 3K and 7K in several of the Pd-Rh alloys as well as in Pd-0.5% Ru and Pd-43% Pt. These minima are attributed to a temperature dependent decrease of the impurity (residual) resistivity, due to a reduction in s-d scattering with increasing temperature, rather than to any form of magnetic scattering. It is also found that all alloys exhibiting resistance minima show rather large negative deviations from Matthiessen's rule above about 100K. Arguments are put forward showing that these originate in the same mechanism as gives rise to the resistance minima. At intermediate temperatures of about 50K, positive deviations are observed in all specimens similar to those found in alloys based on noble metals.
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