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
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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