Valla, T., Camacho, J., Pan, Z.-H., Fedorov, A. V., Walters, A. C., Howard, C. A., Ellerby, M. and Howard, Christopher (2009) Anisotropic Electron-Phonon Coupling and Dynamical Nesting on the Graphene Sheets in Superconducting CaC6 using Angle-Resolved Photoemission Spectroscopy. Physical Review Letters, 102 (10).
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We present the first angle-resolved photoemission studies of electronic structure in CaC6, a superconducting graphite intercalation compound with T-c=11.6 K. We find that, contrary to theoretical models, the electron-phonon coupling on the graphene-derived Fermi sheets with high-frequency graphene-derived phonons is surprisingly strong and anisotropic. The shape of the Fermi surface is found to favor a dynamical intervalley nesting via exchange of high-frequency phonons. Our results suggest that graphene sheets play a crucial role in superconductivity in graphite intercalation compounds.
This is a Submitted version This version's date is: 13/3/2009 This item is not peer reviewed
https://repository.royalholloway.ac.uk/items/bea37d59-cd76-e58f-b76e-959f18012f81/8/
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