Far-infrared signature of the superconducting gap in intercalated graphite CaC6
U. Nagel, D. Hüvonen, E. Joon, J. S. Kim, R. K. Kremer, T. Rõõm
DOI 10.1103/PhysRevB.78.041404 · Physical Review B
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Abstract
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 2Δ0 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 et al. [Phys. Rev. B 75, 020511(R) (2007)]. The temperature dependence of the superconducting gap is characteristic for a BCS type superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.5 | Pressure not reported | unknown |
| CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.5 | Pressure not reported | unknown |
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