SCALING BEHAVIOR OF DRIVEN INTERFACES ABOVE THE DEPINNING TRANSITION

We study the depinning transition for models representative of each of the two universality classes of interface roughening with quenched di sorder. For one of the universality classes, the roughness exponent ch anges value at the transition, while the dynamical exponent remains un changed. We also find that the prefactor of the width scales with the driving force. We propose several scaling relations connecting the val ues of the exponents on both sides of the transition, and discuss some experimental results in light of these findings.