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

    Author
    McManus, Thomas P.
    View/Open
    178027_thesis.pdf (4.760Mb)
    Other Contributors
    Brown, E.; Casabella, Philip Anthony; Huntington, H.; Levinger, Joseph S., 1921-; Flaherty, J. E., 1943-;
    Date Issued
    1976-09
    Subject
    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.;
    Metadata
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    URI
    https://hdl.handle.net/20.500.13015/1897
    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;
    Access
    Restricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.;
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    • RPI Theses Online (Complete)

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