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Publication Detail
Anisotropic Electron-Phonon Coupling and Dynamical Nesting on the Graphene Sheets in Superconducting CaC6 using Angle-Resolved Photoemission Spectroscopy
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Valla T, Camacho J, Pan ZH, Fedorov AV, Walters AC, Howard CA, Ellerby M
  • Publisher:
    AMER PHYSICAL SOC
  • Publication date:
    13/03/2009
  • Journal:
    PHYS REV LETT
  • Volume:
    102
  • Issue:
    10
  • Print ISSN:
    0031-9007
  • Language:
    EN
  • Keywords:
    GRAPHITE, INTERCALATION, ENERGY, STATE
  • Addresses:
    Valla, T
    Brookhaven Natl Lab
    Condensed Matter Phys & Mat Sci Dept
    Upton
    NY
    11973
    USA

    UCL
    Dept Phys & Astron
    London
    WC1E 6BT
    England
Abstract
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.
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