Effects of pinning on the flux flow Hall resistivity

We demonstrate that pinning strongly renormalizes both longitudinal and Hal l resistivity in the flux flow regime. Using a simple model for the pinning potential we show that the magnitude of the vortex contribution to the Hal l voltage decreases with increase in the pinning strength. The Hall resisti vity rho(xy) scales as rho(xx)(2) only for a weak pinning. On the contrary, a strong pinning breaks the scaling relation and can even result in a sign reversal of rho(xy).