MAGNETIC-FLUX LINE IN A DISORDERED MEDIUM

We numerically study a single flux-line motion through a disordered medium, on the basis of the Langevin-type stochastic equation of motion. The flux line is driven by a transport current and also fluctuates by the disorder and the thermal noise. Performing large-scale simulations of the model for parameters associated with the YBCO sample, we examine some scaling exponents characterizing the thermal and disorder effects on the flux-line motion with and without the transport current.