Superconducting graphene sheets in CaC6 enabled by phonon-mediated interband interactions

S.-L. Yang, J. A. Sobota, C. A. Howard, C. J. Pickard, M. Hashimoto, D. H. Lu, S.-K. Mo, P. S. Kirchmann and Z.-X. Shen ()
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S.-L. Yang: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
J. A. Sobota: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
C. A. Howard: University College London
C. J. Pickard: University College London
M. Hashimoto: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road
D. H. Lu: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road
S.-K. Mo: Advanced Light Source, Lawrence Berkeley National Laboratory
P. S. Kirchmann: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
Z.-X. Shen: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory

Nature Communications, 2014, vol. 5, issue 1, 1-5

Abstract: Abstract There is a great deal of fundamental and practical interest in the possibility of inducing superconductivity in a monolayer of graphene. But while bulk graphite can be made to superconduct when certain metal atoms are intercalated between its graphene sheets, the same has not been achieved in a single layer. Moreover, there is a considerable debate about the precise mechanism of superconductivity in intercalated graphite. Here we report angle-resolved photoelectron spectroscopy measurements of the superconducting graphite intercalation compound CaC6 that distinctly resolve both its intercalant-derived interlayer band and its graphene-derived π* band. Our results indicate the opening of a superconducting gap in the π* band and reveal a substantial contribution to the total electron–phonon-coupling strength from the π*-interlayer interband interaction. Combined with theoretical predictions, these results provide a complete account for the superconducting mechanism in graphite intercalation compounds and lend support to the idea of realizing superconducting graphene by creating an adatom superlattice.

Date: 2014
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DOI: 10.1038/ncomms4493

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