Tilt effect in the electron drag of dislocations in metals

Abstract

We study the electron drag force acting on a moving dislocation in the presence of strong magnetic field H. We show that the drag force has a sharp minimum at ϕ = 0, where ϕ is an angle between the dislocation axis and H. The typical width of the minimum is of the order of ϕ_c = V/v _F (V is the velocity of dislocation and v _F is the Fermi velocity). The minimum is due to the compensation of the deformation and electromagnetic contributions to the electron—dislocation interaction. For ϕ>ϕ_c compensation does not take place and the drag force increases linearly with increasing H. This form of the angular dependence of the drag force is in a qualitative agreement with recent experimental data.