Transport in nearly-free-electron metals. IV. Electromigration in zinc

Abstract

The electromigration of a weak scattering impurity in a Bloch electron gas is reconsidered formally while taking into account the conduction-electron screening in the Hartre approximation. Several simplifying approximations are introduced into the formal expressions for the effective charge, and a numerical evaluation of the formulas for $Z_a^{*}$ and $Z_c^{*}$ in zinc yields values in good agreement with experiment. Anisotropic relaxation times, resulting from the observed phonon dispersion curves, tend to favor mass transport in the basal plane.