Surface phonons of the superconducting materials NbC(100) and TaC(100)

C. Oshima, R. Souda, M. Aono, S. Otani, Y. Ishizawa

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    Abstract

    The dispersion curves of both the optical and acoustical surface phonons in the superconducting compounds NbC(100) and TaC(100) have been determined over the entire Brillouin zone of the M symmetry axis by use of angle-resolved high-resolution electron-energy-loss spectroscopy. In contrast to the bulk phonon, no anomalies (dip) due to the electron-phonon coupling in the dispersion curves of the longitudinal phonon have been found at these surfaces. Conversely, the in-plane force constant between carbon and metal atoms is strongly enhanced there.

    Original languageEnglish
    Pages (from-to)240-243
    Number of pages4
    JournalPhysical Review Letters
    Volume56
    Issue number3
    DOIs
    Publication statusPublished - 1986

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    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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