Electronic damping of dislocations and kinetic phenomena in superconductors under plastic deformation

Abstract

Interaction of a moving screw dislocation with conduction electrons is considered in the conventional pure superconductors. At temperaturesT≪T _c , both “slow” dislocations are considered, which interact only with thermally excited quasiparticles, and “fast” dislocations which also break the Cooper pairs. Near the critical temperature, two limiting cases are considered depending on the relation between Meissner penetration depth and anomalous skin-layer depth for the dislocation-induced electromagnetic field. Power dissipation dependence on temperature and dislocation velocity is obtained. Due to low field intensity in the short-wave part of spectrum, the superconducting state is shown not to be destructed by a moving dislocation in a broad range of temperatures. Non-equilibrium states of electronic system created by the dislocation field are analyzed in the paper. With this purpose, Eliashberg’s kinetic equation for a multi-mode excitation source is used. Dislocation field is shown to reduce the order parameter whenT≪T _c , or stimulate superconductivity when(T−T _c )/T _c≪ 1. Damping reduction due to stimulation effect is discussed. Power dissipation dependence on the dislocations concentration in non-equilibrium state is obtained.