Phenomenological description of the microwave surface impedance and complex conductivity of high-Tc single crystals
Abstract
Measurements of the microwave surface impedance Zs(T)=Rs(T)+iXs(T) and of the complex conductivity σs(T) of high-quality, high-Tc single crystals of YBCO, BSCCO, TBCCO, and TBCO are analyzed. Experimental data of Zs(T) and σs(T) are compared with calculations based on a modified two-fluid model which includes temperature-dependent quasiparticle scattering and a unique temperature variation of the density of superconducting carriers. We elucidate agreement as well as disagreement of our analysis with the salient features of the experimental data. Existing microscopic models are reviewed which are based on unconventional symmetry types of the order parameter and on novel mechanisms of quasiparticle relaxation.
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