Two-fluid interpretation of the conductivity of clean BCS superconductors
A. John Berlinsky, C. Kallin, G. Rose, A.-C. Shi
DOI 10.1103/PhysRevB.48.4074 · Physical Review B
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Abstract
The temperature and frequency dependence of the microwave and optical conductivity are studied for a BCS superconductor with weak elastic scattering [1/τ<2Δ(0), where τ is the scattering time and Δ(T) is the BCS energy gap]. The results are interpreted in terms of a two-fluid model in which the combined oscillator strength of the δ function at the origin and the thermally excited free-carrier conductivity is found to be only weakly temperature dependent. The low-frequency conductivity is shown to be a function of ωτ, in the clean limit, with a characteristic logarithmic divergence at ω=0. The frequency dependence of the microwave surface resistance is discussed and comparison is made to the recent experimental results of Bonn, Hardy, and co-workers on YBa2Cu3O7−δ single crystals.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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