Transition de dépiégeage élastique de vortex supraconducteurs

We present 2D numerical simulation results of superconductor vortex lattices driven over a random disorder. The vortex dynamics at the depinning threshold F c is studied at zero temperature in the case of weak disorder. The dynamics is elastic and the depinning transition is analysed in the framework of a second order phase transition where the velocity response v to the driving force F behaves like v ~ (F − F c )β . The analysis of the critical region of several large lattice sizes leads to the result that β = 0.27 ± 0.04.