Abstract
A method for calculating the two-particle electron Green function (alloy conductivity) based on the cluster expansion for the scattering T-matrix is developed. Taking into account scattering processes on all pairs of atoms, an analytical expression for the conductivity of alloys with short-range and long-range order is obtained. The coherent potential approximation is selected as a zero approximation. It is shown that the change in the electronic spectrum due to ordering leads to an essential change in alloy conductivity.
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