Sub-THz electrodynamics of the graphene-like superconductor CaAlSi

S. Lupi; L. Baldassarre; M. Ortolani; C. Mirri; U. Schade; R. Sopracase; T. Tamegai; R. Fittipaldi; A. Vecchione; P. Calvani

doi:10.1103/PhysRevB.77.054510

Sub-THz electrodynamics of the graphene-like superconductor CaAlSi

Superconductivity 2009-11-13 v1 Strongly Correlated Electrons

Authors: S. Lupi , L. Baldassarre , M. Ortolani , C. Mirri , U. Schade , R. Sopracase , T. Tamegai , R. Fittipaldi , A. Vecchione , P. Calvani

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Abstract

We report the first optical study of CaAlSi, a superconductor which displays both the crystal structure of MgB2 and the electronic band structure of intercalated graphites. The reflectivity of a CaAlSi single crystal was measured down to sub-THz frequencies and to 3.3 K, with the use of Coherent Synchrotron Radiation. A superconducting gap in the hexagonal planes, two gaps along the c axis were found and measured, as expected from the structure of the CaAlSi Fermi surface. The anisotropic optical parameters of the normal state were also determined.

Keywords

CaAlSi superconductor sub-THz electrodynamics optical reflectivity superconducting gap Fermi surface anisotropy

Cite

@article{arxiv.0710.2259,
  title  = {Sub-THz electrodynamics of the graphene-like superconductor CaAlSi},
  author = {S. Lupi and L. Baldassarre and M. Ortolani and C. Mirri and U. Schade and R. Sopracase and T. Tamegai and R. Fittipaldi and A. Vecchione and P. Calvani},
  journal= {arXiv preprint arXiv:0710.2259},
  year   = {2009}
}

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4 pages, 4 figures

Sub-THz electrodynamics of the graphene-like superconductor CaAlSi

Abstract

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