Thermal Conductivity as a Probe of Quasi-Particles in the Cuprates

Details Thermal Conductivity as a Probe of Quasi-Particles in the Cuprates Thermal Conductivity as a Probe of Quasi-Particles in the Cuprates

1999-04-12

arxiv.org/abs/cond-mat/9904160v1

Physics

Condensed Matter

Superconductivity

5 pages in Tex, 4 figures in EPS

Scientific paper

In underdoped YBa_2Cu_3O_x (x=6.63), the low-T thermal conductivity Kappa_xx varies steeply with field B at small B, and saturates to a nearly field-independent value at high fields. The simple expression [1+p(T)|B|]^(-1) provides an excellent fit to Kappa_xx(B) over a wide range of fields. From the fit, we extract the zero-field mean-free-path, and the low temperature behavior of the QP current. The procedure also allows the QP Hall angle Theta_QP to be obtained. We find that Theta_QP falls on the 1/T^2 curve extrapolated from the electrical Hall angle above Tc. Moreover, it shares the same T dependence as the field scale p(T) extracted from Kappa_xx. We discuss implications of these results.

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