Inelastic X-ray Scattering Study of Phonons in Superconducting CaC6

Details Inelastic X-ray Scattering Study of Phonons in Superconducting CaC6 Inelastic X-ray Scattering Study of Phonons in Superconducting CaC6

2007-09-08

arxiv.org/abs/0709.1179v2

Physics

Condensed Matter

Superconductivity

Scientific paper

We investigate the dispersion and temperature dependence of a number of phonons in the recently discovered superconductor CaC6 utilizing inelastic x-ray scattering. Four [00L] and two ab-plane phonon modes are observed, and measured at temperatures both above and below T_c. In general, our measurements of phonon dispersions are in good agreement with existing theoretical calculations of the phonon dispersion. This is significant in light of several discrepancies between experimental measurements of phonon-derived quantities and theoretical calculations. The present work suggests that the origin of these discrepancies lies in the understanding of the electron-phonon coupling in this material, rather than in the phonons themselves.

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