Numerical Study Of Magnetic-Flux Lines In Random-Media

We study numerically the dynamical behavior of magnetic flux lines in type-II superconductors, on the basis of the stochastic equation of motion for interacting flux lines with anisotropic effective mass. We first discuss a computationally efficient modeling for this equation and then carry out three-dimensional simulations for the flux line dynamics in random media. We particularly examine the effects of thermal noise and quenched random impurities on the onset temperature of diffusion of the flux lines.