A density of states calculation in disordered alloys by a generalized coherent-potential approximation
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Authors
McManus, Thomas P.
Issue Date
1976-09
Type
Electronic thesis
Thesis
Thesis
Language
ENG
Keywords
Physics
Alternative Title
Abstract
The coherent-potential approximation (CPA) of Soven has proven to be a very effective tool in solving the problem of a disordered binary alloy for the electronic density of states. It is generally considered to be the best known single site approximation. In this study we generalize the CPA to allow both consideration of clusters of sites and
of random off-diagonal elements of the Hamiltonian. Calculations have been made for a simple one dimensional disordered binary alloy in the tight binding model. The results of these calculations are presented and analyzed. Our results are compared with exact computer model calculations and are seen to reproduce the central features of the density of states spectra quite well. We conclude that our generalization of the CPA is a viable one, deserving further study.
Description
September 1976
School of Science
School of Science
Full Citation
Publisher
Rensselaer Polytechnic Institute, Troy, NY