Localized Enhancement Effects in Pd-Ag Alloys

Abstract

Low-temperature electrical resistivities of Pd-Ag alloys show a positive $T^2$ temperature dependence in the concentration range above 60 at.% Ag. This behavior supplements the well-known resistivity minima observed in alloys with lower concentrations of Ag, and strongly favors the model of scattering from localized exchange-enhanced Pd $d$ states, as against $s\to d$ scattering in the rigid-, or collective-, band description of the alloys.