Phonon softening in superconducting diamond

M. Hoesch, T. Fukuda, J. Mizuki, T. Takenouchi, Hiroshi Kawarada, J. P. Sutter, S. Tsutsui, A. Q R Baron, M. Nagao, Y. Takano

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    Abstract

    We observe strong softening of optical-phonon modes in superconducting (Tc =4.2 K) boron-doped diamond near the Brillouin-zone center using inelastic x-ray scattering from a chemical vapor deposition grown highly oriented sample. The magnitude of the softening, and our observation that it becomes stronger approaching zone center, supports theoretical models suggesting a phonon-mediated pairing mechanism via coupling of optical-phonon modes to Fermi surfaces around the zone center. The electron-phonon coupling parameter is determined as approximately λ=0.33.

    Original languageEnglish
    Article number140508
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume75
    Issue number14
    DOIs
    Publication statusPublished - 2007 Apr 18

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    ASJC Scopus subject areas

    • Condensed Matter Physics

    Cite this

    Hoesch, M., Fukuda, T., Mizuki, J., Takenouchi, T., Kawarada, H., Sutter, J. P., Tsutsui, S., Baron, A. Q. R., Nagao, M., & Takano, Y. (2007). Phonon softening in superconducting diamond. Physical Review B - Condensed Matter and Materials Physics, 75(14), [140508]. https://doi.org/10.1103/PhysRevB.75.140508