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Extensive measurements of the microwave conductivity of highly pure andoxygen-ordered \YBCO single crystals have been performed as a means ofexploring the intrinsic charge dynamics of a d-wave superconductor. Broadbandand fixed-frequency microwave apparatus together provide a very clear pictureof the electrodynamics of the superconducting condensate and its thermallyexcited nodal quasiparticles. The measurements reveal the existence of verylong-lived excitations deep in the superconducting state, as evidenced by sharpcusp-like conductivity spectra with widths that fall well within ourexperimental bandwidth. We present a phenomenological model of the microwaveconductivity that captures the physics of energy-dependent quasiparticledynamics in a d-wave superconductor which, in turn, allows us to examine thescattering rate and oscillator strength of the thermally excited quasiparticlesas functions of temperature. Our results are in close agreement with theFerrell-Glover-Tinkham sum rule, giving confidence in both our experiments andthe phenomenological model. Separate experiments for currents along the $\hata$ and $\hat b$ directions of detwinned crystals allow us to isolate the roleof the CuO chain layers in \YBCO, and a model is presented that incorporatesboth one-dimensional conduction from the chain electrons and two-dimensionaltransport associated with the \cuplane plane layers.Comment: 17 pages, 13 figure

physical review. b, condensed matter and materials physics

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Phenomenology ofâ-axis andb̂-axis charge dynamics from microwave spectroscopy of highly ordered