Abstract
Short-range order effects in the electronic density of states of a binary alloy are analysed in the framework of a single-site self-consistent theory; the locator-interactor formalism is employed. Two equivalent approaches are presented: one is a special diagrammatic technique and the other is an effective-medium treatment. The method is exact for extreme attractive or repulsive correlation between the two alloy components, while it reduces to the conventional CPA for a random alloy. The present development gives simple expressions for the Green function of the alloy, and the evaluation of local and total densities of electronic states involves little numerical work.