Surface-phonon dispersion curves of TiC(100)

C. Oshima, T. Aizawa, M. Wuttig, R. Souda, S. Otani, Y. Ishizawa, H. Ishida, K. Terakura

    研究成果: Article査読

    32 被引用数 (Scopus)


    The surface-phonon dispersion curves of the TiC(100) surface along both the M and X azimuths of the two-dimensional Brillouin zone have been measured by electron-energy-loss spectroscopy (EELS). We have observed two acoustical-phonon branches (Rayleigh and resonance modes) and three optical-phonon branches (Wallis, Lucas, and new modes). Those experimental curves are in good agreement with the theoretical ones calculated on the basis of a screened-shell model. In this calculation, the 20% stiffening of the stretching force constant between the first-layer Ti atom and the second-layer carbon produces a quasitransverse mode localized strongly at the second-layer carbon, which corresponds to the new observed surface mode. The local spectral densities calculated with use of these parameters have been compared with the experimental EELS spectra.

    ジャーナルPhysical Review B
    出版ステータスPublished - 1987

    ASJC Scopus subject areas

    • Condensed Matter Physics

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