Effect of local order on the electronic states of binary alloys

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Abstract
The Green function technique of Edwards (1962) is used to obtain the energy spectrum and density of states for an electron moving in a binary alloy with local order, that is, with a non random distribution of A and B atoms. The model consists of an electron with an effective mass, perturbed by a potential which fluctuates from site to site and has zero average value. The degree of local order in this fluctuating potential is expressed approximately in terms of a single parameter alpha . Calculations for a 50-50 alloy show that the reciprocal lifetime changes greatly as alpha moves from negative (anticlustering) through zero (random) to positive values (clustering). This change should be observable in resistance measurements.

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