A density of states calculation in disordered alloys by a generalized coherent-potential approximation

Authors
McManus, Thomas P.
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Other Contributors
Brown, E.
Casabella, Philip Anthony
Huntington, H.
Levinger, Joseph S., 1921-
Flaherty, J. E., 1943-
Issue Date
1976-09
Keywords
Physics
Degree
PhD
Terms of Use
This electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
Full Citation
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
Department
Dept. of Physics, Applied Physics, and Astronomy
Publisher
Rensselaer Polytechnic Institute, Troy, NY
Relationships
Rensselaer Theses and Dissertations Online Collection
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