Abstract
We have measured the temperature (10 K≤T≤150 K) and magnetic field (B≤9 T) dependence of the in-plane thermal conductivity κ(T, B) of YBa2Cu3O7−x(Y123), YBa2Cu4O8(Y124), and Bi2Sr2CaCu2O8(Bi2212) high-temperature superconducting crystals, at different orientations of the magnetic fieldB∥cand ⊥c). Our results show that κ depends on field below and above the critical temperature due to the contribution of superconducting fluctuations and of vortices and orbital effects to the scattering of quasiparticles or electrons. Within experimental resolution no dimensional crossover of the superconducting fluctuations can be clearly recognized. Qualitative and quantitative differences in the field dependence between the crystals are observed and discussed. We argue that the anisotropy plays a mayor role in the relative weight between the different scattering processes and the field effect on the occupation number of quasiparticles, determining the field dependence of the thermal conductivity in these cuprates. In particular we found that k increases with field in a Bi2212 crystal forB⊥cand at T<20 K.
Published Version
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