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

U. Nagel, D. Hüvonen, E. Joon, J. S. Kim, R. K. Kremer, and T. Rõõm
Phys. Rev. B 78, 041404(R) – Published 21 July 2008

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.

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  • Received 16 April 2008

DOI:https://doi.org/10.1103/PhysRevB.78.041404

©2008 American Physical Society

Authors & Affiliations

U. Nagel1,*, D. Hüvonen1, E. Joon1, J. S. Kim2, R. K. Kremer2, and T. Rõõm1

  • 1National Institute of Chemical Physics and Biophysics, Akadeemia Tee 23, 12618 Tallinn, Estonia
  • 2Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany

  • *urmas.nagel@kbfi.ee

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Issue

Vol. 78, Iss. 4 — 15 July 2008

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