The kinetic theory of flux creep in inhomogeneous superconductors

We suggest a new theoretical model of the flux creep in inhomogeneous superconductors taking into consideration the interaction between magnetic vortices. The flux motion is shown to enhance when the inter vortex interaction is significant. The flux lines interaction results in sharp amplification of the flux creep and in the new kinetic equation for the concentration of vortices. Using the microscopic model we have found the nonlinear equation to describe the flux lines density variations. It results in changes of the flux line kinetics even at low flux density.