Strong vibrational mode signatures in surface alloys

A. Khater, H. Grimech, J. Lapujoulade, F. Fabre

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    Abstract

    A formalism for calculating the surface phonon dispersion curves in surface alloys, is presented, using the matching technique and an effective field approach that goes beyond the virtual crystal approximation. Numerical results are exemplified for the [010] direction in the PtcCu1 - c first layer alloy on a Cu(001) substrate, for random and Ising correlated distributions of Pt and Cu atoms. For different Pt concentrations, the surface alloy is characterized strongly by different mode signatures in the window of the projected bulk phonon distribution on the Cu(001) surface, at energies of ~ 20 meV. The initial Rayleigh mode shifts are significant, and another Rayleigh mode appears, with increasing Pt concentrations. This second mode distinguishes between random and correlated distributions within instrument resolution of He scattering and EELS.

    Original languageEnglish
    Pages (from-to)381-382
    Number of pages2
    JournalSurface Science
    Volume251-252
    Issue numberC
    DOIs
    Publication statusPublished - 1 Jul 1991

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    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Materials Chemistry

    Cite this

    Khater, A., Grimech, H., Lapujoulade, J., & Fabre, F. (1991). Strong vibrational mode signatures in surface alloys. Surface Science, 251-252(C), 381-382. https://doi.org/10.1016/0039-6028(91)91019-T