Physics – Condensed Matter – Superconductivity
Scientific paper
1998-10-23
Physics
Condensed Matter
Superconductivity
4 pages, 2 included eps figures, significant new analysis wrt other experiments, to appear in Phys Rev Lett 29 March 1999
Scientific paper
10.1103/PhysRevLett.82.2943
The effect of vortices on quasiparticle transport in cuprate superconductors was investigated by measuring the low temperature thermal conductivity of YBa_2Cu_3O_6.9 in magnetic fields up to 8 T. The residual linear term (as T \to 0) is found to increase with field, directly reflecting the occupation of extended quasiparticle states. A study for different Zn impurity concentrations reveals a good agreement with recent calculations for a d-wave superconductor, thereby shedding light on the nature of scattering by both impurities and vortices. It also provides a quantitative measure of the gap near the nodes.
Chiao May
Gagnon Robert
Hill R. W.
Lupien Christian
Popic Bojana
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