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Multiple-scattering theory of electron transport in disordered metals in the muffin-tin potential model. I. Effective-medium approximation formulation and the separation of off-shell corrections

The effective-medium approximation formulation of electron transport in disordered metals due to Roth and Singh (see Phys. Rev. B, vol.25, p.2522, 1982) is reconsidered using the muffin-tin potential model. The theory is reduced into a tractable form by using the non-overlapping condition of muffin-tin spheres. The major part of the off-shell correction is shown to be absorbed in the on-shell expression by adding simple correction factors.