Conductivity Due to Classical Phase Fluctuations in a Model For High-T_c Superconductors

Details Conductivity Due to Classical Phase Fluctuations in a Model For High-T_c Superconductors Conductivity Due to Classical Phase Fluctuations in a Model For High-T_c Superconductors

2000-02-22

arxiv.org/abs/cond-mat/0002346v1

Phys. Rev. B 61, R14924 (2000)

Physics

Condensed Matter

Superconductivity

4pages, 2figures, submitted to Phys.Rev.B

Scientific paper

10.1103/PhysRevB.61.R14924

We consider the real part of the conductivity, \sigma_1(\omega), arising from classical phase fluctuations in a model for high-T_c superconductors. We show that the frequency integral of that conductivity, \int_0^\infty \sigma_1 d\omega, is non-zero below the superconducting transition temperature $T_c$, 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 \sigma_1(\omega) explicitly for a model of overdamped phase fluctuations.

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