Magnetothermo-emf and Wiedemann-Franz law for tungsten single crystals under the conditions of static skin effect

Abstract

Results of the experimental investigation of the thermal conductivity, the thermo-emf, the Nernst effect, and the magnetoresistance of thin monocrystalline tungsten films under conditions of static skin effect in the temperature range T=2–18 K in magnetic fields of up to 28 kOe are presented. It is shown that the field dependence of the magnetothermo-emf follows the predictions of the theory of galvano-and thermomagnetic phenomena in strong fields and exhibits anisotropy associated with both the shape of the sample and reflecting properties of the crystal surface. The temperature dependence of the magnetothermo-emf is investigated and a contribution from the phonon drag is detected. The surface contribution to the electrical and thermal conductivity under conditions of the static skin effect is singled out, and the temperature dependence of the Lorentz number for surface scattering is traced.