Conductivity Due to Classical Phase Fluctuations in a Model For High-Tc Superconductors
Abstract
We consider the real part of the conductivity, σ1(ω), arising from classical phase fluctuations in a model for high-Tc superconductors. We show that the frequency integral of that conductivity, ∫0∞ σ1 dω, is non-zero below the superconducting transition temperature Tc, provided there is some quenched disorder in the system. Furthermore, for a fixed amount of quenched disorder, this integral at low temperatures is proportional to the zero-temperature superfluid density, in agreement with experiment. We calculate σ1(ω) explicitly for a model of overdamped phase fluctuations.
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