Physics – Condensed Matter – Superconductivity
Scientific paper
1998-11-03
Physics
Condensed Matter
Superconductivity
13 pages with 10 figures. submitted to Phys Rev B
Scientific paper
10.1103/PhysRevB.60.1349
We present here the microwave surface impedance of a high purity crystal of $YBa_2Cu_3O_{6.99}$ 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 $T_c$ and the very weak impurity scattering in the high purity $BaZrO_3$-grown crystal used in this study. Above 20 K, the scattering increases dramatically, initially at least as fast as $T^4$.
Bonn Douglas A.
Dosanjh P.
Hardy Walter N.
Harris Rosemary
Hosseini Ali
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