Residual absorption at zero temperature in d-wave superconductors

Abstract

In a d-wave superconductor with elastic impurity scattering, not all the available optical spectral weight goes into the condensate at zero temperature, and this leads to residual absorption. We find that for a range of impurity parameters in the intermediate coupling regime between Born (weak) and unitary (strong) limit, significant oscillator strength remains which exhibits a cusp like behavior of the real part of the optical conductivity with upward curvature as a function of frequency, as well as a quasilinear temperature dependence of the superfluid density. The calculations offer an explanation of recent data on ortho-II YBa${}_2$Cu${}_3$O${}_{6.5}$ which has been considered anomalous.

Accepted for publication by Phys. Rev. B 7 Pages and 4 Figures

References in corpus (2)

• Comparison of in- and out-of-plane charge dynamics in YBa_2Cu_3O_{6.95}
• Microwave conductivity of YBa${}_2$Cu${}_3$O${}_{6.99}$ including inelastic scattering

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