Broadening of the tilt-effect peak in the drag of dislocations in metals due to chaotic scattering of electrons

The electron drag force on a moving dislocation in a magnetic field H intro duces a sharp maximum in the drag stress when H is parallel to the dislocat ion line (tilt-effect). The width of this maximum is proportional to the ra dius of the effective electron-dislocation interaction which, in linear the ory, is of the order of the Burgers vector b. However, by using a nonlinear approach to this interaction we show that this width is much larger than i n the linear case, and is given by the parameter (b/R)(1/3), where R is the cyclotron radius. The estimate for the width of the tilt-effect, obtained from the nonlinear approach, is in good agreement with the experimental res ults, unlike the width obtained from linear theory.