Upton, M. H., Walters, A. C., Howard, C. A., Rahnejat, K. C., Ellerby, M., Hill, J. P., McMorrow, D. F., Alatas, A., Leu, Bogdan M., Ku, Wei and Howard, Christopher (2007) Phonons in superconducting CaC6 studied via inelastic x-ray scattering. Physical Review B, 76 (22).
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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.
This is a Submitted version This version's date is: 12/2007 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/aabd599a-9f8d-c636-9851-54f787e2c85d/6/
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