Renormalization of thermal conductivity of disordered d-wave superconductors by impurity-induced local moments

Details Renormalization of thermal conductivity of disordered d-wave superconductors by impurity-induced local moments Renormalization of thermal conductivity of disordered d-wave superconductors by impurity-induced local moments

2006-07-26

arxiv.org/abs/cond-mat/0607682v2

Physica C: Superconductivity, 460-462, 744 (2007)

Physics

Condensed Matter

Superconductivity

2 pages, 1 figure, submitted to M2S-HTSC VIII, Dresden 2006

Scientific paper

10.1016/j.physc.2007.03.364

The low-temperature thermal conductivity \kappa_0/T of d-wave superconductors is generally thought to attain a "universal" value independent of disorder at sufficiently low temperatures, providing an important measure of the magnitude of the gap slope near its nodes. We discuss situations in which this inference can break down because of competing order, and quasiparticle localization. Specifically, we study an inhomogeneous BCS mean field model with electronic correlations included via a Hartree approximation for the Hubbard interaction, and show that the suppression of \kappa_0/T by localization effects can be strongly enhanced by magnetic moment formation around potential scatterers.

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