Vortex dynamics and retardation in a type-II superconductor with weak defects

The dynamics of an Abrikosov vortex and the vortex lattice in a type-II sup erconductor with weak defects is studied taking into account both inertial and gyroscopic (Hall) properties. The spectrum of normal modes of vortices has two branches. It is shown that due to the interaction between defects a nd a moving vortex the excitation of these normal mode oscillations occurs. This leads to the appearance of an additional channel of the vortex retard ation. In the case of a single vortex the corresponding friction force dive rges at V --> 0 as V-1/2; i.e., in the limit of small velocities it prevail s over the regular (bare) viscous friction force.