Quasiparticle thermal Hall angle and magnetoconductance in YBa_2Cu_3O_x

TL;DR

This paper introduces a method to determine quasiparticle thermal conductivity and mean-free-path in YBa_2Cu_3O_x using thermal Hall effect and magnetoconductance, revealing a relation with electrical Hall angle and anisotropic scattering.

Contribution

It provides a novel approach to extract quasiparticle transport properties from thermal Hall measurements and establishes a connection with electrical Hall angle in cuprate superconductors.

Findings

Thermal Hall angle Theta_Q relates to the H-dependence of Kappa_e.

Numerical equality between Theta_Q and electrical Hall angle.

Evidence of anisotropic scattering in the normal state.

Abstract

We present a way to extract the quasiparticle (qp) thermal conductivity Kappa_e and mean-free-path in YBa_2Cu_3O_x, using the thermal Hall effect and the magnetoconductance of Kappa_e. The results are very consistent with heat capacity experiments. Moreover, we find a simple relation between the thermal Hall angle Theta_Q and the H-dependence of Kappa_e, as well as numerical equality between Theta_Q and the electrical Hall angle. The findings also reveal an anomalously anisotropic scattering process in the normal state.