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Influence of temperature on the nodal properties of the longitudinal thermal conductivity of YBa $\mathsf{_2}$ Cu $\mathsf{_3}$ O $\mathsf{_{7-x}}$

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  • R. Ocaña
  • P. Esquinazi

Abstract

The angle dependence at different temperatures of the longitudinal thermal conductivity $\kappa_{xx}(\theta)$ in the presence of a planar magnetic field is presented. In order to study the influence of the gap symmetry on the thermal transport, angular scans were measured up to a few Kelvin below the critical temperature T c . We found that the four-fold oscillation of $\kappa_{xx}(\theta)$ vanishes at T > 20K and transforms into a one-fold oscillation with maximum conductivity for a field of 8 T applied parallel to the heat current. Nevertheless, the results indicate that the d-wave pairing symmetry remains the main pairing symmetry of the order parameter up to T c . Numerical results of the thermal conductivity using an Andreev reflection model for the scattering of quasiparticles by supercurrents under the assumption of d-wave symmetry provide a semiquantitative description of the overall results. Copyright Springer-Verlag Berlin/Heidelberg 2003

Suggested Citation

  • R. Ocaña & P. Esquinazi, 2003. "Influence of temperature on the nodal properties of the longitudinal thermal conductivity of YBa $\mathsf{_2}$ Cu $\mathsf{_3}$ O $\mathsf{_{7-x}}$," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 34(2), pages 135-142, July.
    • Handle: RePEc:spr:eurphb:v:34:y:2003:i:2:p:135-142
    DOI: 10.1140/epjb/e2003-00205-5
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