We calculate the microwave conductivity of a dₓ²-y² superconductor in the presence of elastic impurity scattering and inelastic scattering due to antiferromagnetic spin fluctuations. The low-temperature conductivity does not simply reflect the linear temperature dependence of the number of quasiparticles in a d-wave system, as often supposed. We compare with recent data on high-quality YBa₂{Cu}₃O6.95 single crystals.
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Hirschfeld et al. (1993) studied this question.
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