APPROXIMATIONS MADE IN EVALUATING THE RESIDUAL ELECTRICAL DC RESISTIVITY OF DISORDERED ALLOYS

The residual electrical dc resistivity of the transition-metal-alloy s ystem Cu-Pt is evaluated by making use of the relativistic version of the Korringa-Kohn-Rostoker-coherent potential approximation and the on e-electron Kubo-Greenwood formula for disordered systems. Starting fro m the results of a previous calculation the influence of truncation of the angular momentum expansion, the effects of self-consistency of th e alloy potential, the importance of vertex corrections, and the diffe rence between the nonrelativistic and the relativistic current operato r are examined.