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Publication Detail
Electronic Structure of Superconducting KC8 and Nonsuperconducting LiC6 Graphite Intercalation Compounds: Evidence for a Graphene-Sheet-Driven Superconducting State
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Pan ZH, Camacho J, Upton MH, Fedorov AV, Howard CA, Ellerby M, Valla T
  • Publisher:
    AMER PHYSICAL SOC
  • Publication date:
    06/05/2011
  • Journal:
    PHYS REV LETT
  • Volume:
    106
  • Issue:
    18
  • Print ISSN:
    0031-9007
  • Language:
    EN
  • Keywords:
    INTERLAYER STATES, SELF-ENERGY, PHOTOEMISSION, SURFACE
  • Addresses:
    Pan, ZH
    Brookhaven Natl Lab
    Condensed Matter Phys & Mat Sci Dept
    Upton
    NY
    11973
    USA

    UCL
    Dept Phys & Astron
    London
    WC1E 6BT
    England
Abstract
We have performed photoemission studies of the electronic structure in LiC6 and KC8, a non-superconducting and a superconducting graphite intercalation compound, respectively. We have found that the charge transfer from the intercalant layers to graphene layers is larger in KC8 than in LiC6, opposite of what might be expected from their chemical composition. We have also measured the strength of the electron-phonon interaction on the graphene-derived Fermi surface to carbon derived phonons in both materials and found that it follows a universal trend where the coupling strength and superconductivity monotonically increase with the filling of graphene pi* states. This correlation suggests that both graphene-derived electrons and graphene-derived phonons are crucial for superconductivity in graphite intercalation compounds.
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