Far-infrared signature of the superconducting gap in intercalated graphite CaC6

Details Far-infrared signature of the superconducting gap in intercalated graphite CaC6 Far-infrared signature of the superconducting gap in intercalated graphite CaC6

2008-04-16

arxiv.org/abs/0804.2606v2

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.78.041404

Terahertz reflectance spectra of the Ca-intercalated graphite CaC6 reveal a superconducting gap below 11K. The gap signature lacks a sharp onset to full reflectivity at 2Delta, 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 by Sanna et al. (Phys.Rev. B75, 020511, 2007). The temperature dependence of the superconducting gap is characteristic for a BCS type superconductor.

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