Phonon softening in superconducting diamond

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

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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
Issue number14
Publication statusPublished - 2007 Apr 18

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    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].