Mixed-state quasiparticle transport in high-T-c cuprates

Theory of quasiparticle transport in the mixed state of a d-wave supercondu ctor is developed under the assumption of disordered vortex array. A novel universal regime is identified at fields above H* = c*H-c2(T/T-c)(2), chara cterized by a field-independent longitudinal thermal conductivity kappa(xx) (e). It is argued that this behavior is responsible for the high-held plate au in kappa(xx)(e) experimentally observed in high-T-c cuprates.