Surface-phonon dispersion curves of TiC(100)

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

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    20 Citations (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.

    Original languageEnglish
    Pages (from-to)7510-7517
    Number of pages8
    JournalPhysical Review B
    Issue number14
    Publication statusPublished - 1987

    ASJC Scopus subject areas

    • Condensed Matter Physics


    Dive into the research topics of 'Surface-phonon dispersion curves of TiC(100)'. Together they form a unique fingerprint.

    Cite this