Quasiparticle transport in the vortex state of YBa_2Cu_3O_6.9

Abstract

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.

4 pages, 2 included eps figures, significant new analysis wrt other experiments, to appear in Phys Rev Lett 29 March 1999

References in corpus (6)

• The Unusual Superconducting State of Underdoped Cuprates
• Universal Heat Conduction in YBa_2Cu_3O_6.9
• Transport Properties of d-Wave Superconductors in the Vortex State
• Vortex Contribution to Specific Heat of Dirty $d$-Wave Superconductors: Breakdown of Scaling
• Evidence for field-induced excitations in low-temperature thermal conductivity of Bi_2Sr_2CaCu_2O_8
• Mixed-state quasiparticle transport in high-T_c cuprates: localization by magnetic field

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