Journal
PHYSICAL REVIEW B
Volume 78, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.041404
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Terahertz reflectance spectra of the Ca-intercalated graphite CaC6 reveal a superconducting gap below 11 K. The gap signature lacks a sharp onset to full reflectivity at 2 Delta(0) but rather shows a distribution of gap values consistent with an anisotropic gap. The experimental data were successfully fitted to the gap distribution obtained from density-functional calculations of Sanna [Phys. Rev. B 75, 020511(R) (2007)]. The temperature dependence of the superconducting gap is characteristic for a BCS type superconductor.
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