Abstract
A model or pseudo potential is described which is based on the relativistic augmented-plane-wave (RAPW) method for the calculation of the band structure of a pure metal. For a pure metal, this model potential will yield the same band structure as that obtained in the usual RAPW calculation. This model potential is calculated for Au and for Ag, and a Au-impurity model potential for a dilute alloy of Au in Ag is obtained. The impurity electrical resistivity $\frac{\ensuremath{\Delta}\ensuremath{\rho}}{c}$ is calculated and is found to be in near agreement with experiment. Screening is treated in an approximate way and the role of screening in the calculated value of $\frac{\ensuremath{\Delta}\ensuremath{\rho}}{c}$ is discussed. Spinorbit coupling effects are found to contribute strongly to the model potential and to the calculated value of $\frac{\ensuremath{\Delta}\ensuremath{\rho}}{c}$ Spin-flip scattering and the M\"ossbauer isomer shift for Ag(Au) are discussed.
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