Nernst effect beyond the relaxation-time approximation

Article

关键词: BOLTZMANN-EQUATION;    MAGNETOTRANSPORT;    SCATTERING;    METALS;   

DOI  :  10.1103/PhysRevB.84.035133

来源: SCIE

【 摘 要 】

Motivated by recent interest in the Nernst effect in cuprate superconductors, we calculate this magnetothermoelectric 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 in 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.

【 授权许可】

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