Superconducting optical conductivity for arbitrary temperature and mean free path
- 1 June 1991
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 43 (16) , 12804-12808
- https://doi.org/10.1103/physrevb.43.12804
Abstract
Calculations of the optical conductivity of a superconductor valid for any temperature T and any mean free path l are presented. They are based on the method of Marsiglio, Schossmann, and Carbotte of computing the real-frequency-axis gap and renormalization function. The work is applied to a study of the signature of the opening of the gap edge Δ(T) as the superconducting state develops. At finite temperature, the presence of a normal-fluid component leads to absorption down to zero frequency (ω). For sufficiently impure systems there remains, nevertheless, a sharp threshold for additional absorption from the condensate which starts at ω=2Δ(T), so that it is possible to deduce from it an accurate value of Δ(T). For the pure limit, the situation is more ambiguous.Keywords
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