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

Results of the experimental investigation of the thermal conductivity, the thermo-emf, the Nernst effect, and the magnetoresistance of thin monocrysta lline tungsten films under conditions of static skin effect in the temperat ure range T = 2-18 K in magnetic fields of up to 28 kOe are presented. It i s shown that the held dependence of the magnetothermo-emf follows the predi ctions of the theory of galvano- and thermomagnetic phenomena in strong fie lds and exhibits anisotropy associated with both the shape of the sample an d 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 c onductivity under conditions of the static skin effect is singled out, and the temperature dependence of the Lorentz number for surface scattering is traced. (C) 2000 MAIK "Nauka/Interperiodica".