Sub-THz electrodynamics of the graphene-like superconductor CaAlSi

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.

arXiv comment4 pages, 4 figures

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Cited by in corpus (6)

• Probing superconducting energy gap from infrared spectroscopy on a Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$ single crystal with T${}_c$=37 K
• An extended infrared study of the (p,T) phase diagram of the p-doped Cu-O plane
• Pressure effects on the superconducting transition in nH-CaAlSi
• Transmittance and reflectance measurements at terahertz frequencies on a superconducting BaFe_{1.84}Co_{0.16}As_2 ultrathin film: an analysis of the optical gaps in the Co-doped BaFe_2As_2 pnictide
• First-Order Reorientation of the Flux-Line Lattice in CaAlSi
• The study on penetration depth of anisotropic two-band s-wave superconductors by Ginzburg-Landau approach