Thermal Conductivity Tensor in YBa${}_2$Cu${}_3$O${}_{7-x}$: Effects of a Planar Magnetic Field

Abstract

We have measured the thermal conductivity tensor of a twinned YBa${}_2$Cu${}_3$O${}_{7-x}$ single crystal as a function of angle $\theta$ between the magnetic field applied parallel to the CuO${}_2$ planes and the heat current direction, at different magnetic fields and at T=13.8 K. Clear fourfold and twofold variations in the field-angle dependence of ${\kappa }_{xx}$ and ${\kappa }_{xy}$ were respectively recorded in accordance with the d-wave pairing symmetry of the order parameter. The oscillation amplitude of the transverse thermal conductivity ${\kappa }_{xy}^0$ was found to be larger than the longitudinal one ${\kappa }_{xx}^0$ in the range of magnetic field studied here ($0T$$\le B\le 9$$T$). From our data we obtain quantities that are free from non-electronic contributions and they allow us a comparison of the experimental results with current models for the quasiparticle transport in the mixed state.

9 Figures, Phys. Rev. B(in press)

References in corpus (1)

• Angle Dependence of the Transverse Thermal Conductivity in YBa${}_2$Cu${}_3$O${}_7$ single crystals: Doppler Effect vs. Andreev scattering

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