Hall effect in ${\mathrm{YBa}}_2$${\mathrm{Cu}}_3$${\mathrm{O}}_{7\mathrm{-}\mathrm{\delta }}$ in the limit of free flux flow

The Hall effect of an ${\mathrm{YBa}}_2$ ${\mathrm{Cu}}_3$ ${\mathrm{O}}_{7\mathrm{-}\mathrm{\delta }}$ epitaxial film was studied using high pulsed current densities J to suppress flux pinning and reveal intrinsic behavior in the free-flux-flow limit. With increasing J there is an enhancement of the anomalous sign reversal, inconsistent with mechanisms based on pinning and inhomogeneity. At high H and J the Hall angle α appears to decompose into α=${\mathrm{\alpha }}_{\mathit{M}}$+${\mathrm{\alpha }}_{\mathit{n}}$: ${\mathrm{\alpha }}_{\mathit{M}}$(T) saturates to a negative value independent of H and J, and ${\mathrm{\alpha }}_{\mathit{n}}$ (∝H) has the normal-state value. The results are consistent with time-dependent Ginzburg-Landau calculations.