Weak localization and spin-orbital interaction in films based on PbSnAgTe compounds

Abstract

On the basis of the theory of weak localization, taking into account the mechanism of spin-orbit scattering, the laws of the magnetoresistance of the PbSnAgTe films are considered. The dependences of the magnetoresistance of PbSnAgTe films on the composition and thickness in a magnetic field perpendicular to the film surface are investigated. It is shown that for polycrystalline films on mica-muscovite substrates, the time of spin-orbital interaction depends on the composition and may change the sign of the magnetoresistance. With increasing thickness, the intensity of spin-orbital scattering decreases due to decrease of the surface impact.