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Nernst effect beyond the relaxation-time approximation

By D. I. Pikulin, Chang-Yu Hou and C. W. J. Beenakker

Abstract

Motivated by recent interest in the Nernst effect in cuprate superconductors, we calculate this magneto-thermo-electric effect for an arbitrary (anisotropic) quasiparticle dispersion relation and elastic scattering rate. The exact solution of the linearized Boltzmann equation is compared with the commonly used relaxation-time approximation. We find qualitative deficiencies of this approximation, to the extent that it can get the sign wrong of the Nernst coefficient. Ziman's improvement of the relaxation-time approximation, which becomes exact when the Fermi surface is isotropic, also cannot capture the combined effects of anisotropy in dispersion and scattering

Topics: Condensed Matter - Other Condensed Matter
Year: 2011
DOI identifier: 10.1103/PhysRevB.84.035133
OAI identifier: oai:arXiv.org:1105.1303
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