Subterahertz electrodynamics of the graphenelike 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 · Physical Review B
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Abstract
We report an 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 subterahertz frequencies and to 3.3K, with the use of coherent synchrotron radiation. A single superconducting gap in the hexagonal planes and two gaps along the c axis were found and measured consistently with the structure of the CaAlSi Fermi surface. The normal-state optical conductivity is also anisotropic: in the ab plane, the plasma frequency is larger by more than a factor of 2 than along the c axis. An analysis of the ab-plane spectral weight in comparison with the corresponding quantity in a cuprate such as La2−xSrxCuO4 shows that in CaAlSi the correlation effects are negligible.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaAlSi Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.7 | Pressure not reported | zero_resistance |
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