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Microwave Spectroscopy of Thermally Excited Quasiparticles in YBa2Cu3O6.99

A. Hosseini, R. Harris, Saeid Kamal, P. Dosanjh, J. Preston, Ruixing Liang, W. N. Hardy, D. A. Bonn

cond-mat.supr-conarXiv:cond-mat/9811041

Abstract

We present here the microwave surface impedance of a high purity crystal of YBa2Cu3O6.99 measured at 5 frequencies between 1 and 75 GHz. This data set reveals the main features of the conductivity spectrum of the thermally excited quasiparticles in the superconducting state. Below 20 K there is a regime of extremely long quasiparticle lifetimes, due to both the collapse of inelastic scattering below Tc and the very weak impurity scattering in the high purity BaZrO3-grown crystal used in this study. Above 20 K, the scattering increases dramatically, initially at least as fast as T4.

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