Low-Frequency Optical Conductivity in Inhomogeneous d-wave Superconductors

Details Low-Frequency Optical Conductivity in Inhomogeneous d-wave Superconductors Low-Frequency Optical Conductivity in Inhomogeneous d-wave Superconductors

2002-06-24

arxiv.org/abs/cond-mat/0206440v1

Physics

Condensed Matter

Superconductivity

To appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.054517

Motivated by the recent optical conductivity experiments on Bi_2Sr_2CaCu_2O_{8+delta} films, we examine the possible origin of low-frequency dissipation in the superconducting state. In the presence of spatial inhomogeneity of the local phase stiffness rho_s, it is shown that some spectral weight is removed from omega=0 to finite frequencies and contribute to dissipation. A case where both rho_s and the local normal fluid density are inhomogeneous is also considered. We find an enhanced dissipation at low frequency if the two variations are anti-correlated.

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