Out-of-plane hall effect in YBa2Cu3O7-δ:: Vortex-glass behavior and scaling of c-axis and Hall resistivities

The Hall resistivity, rho(zx), and longitudinal resistivity, rho(zz), have been studied in the mixed state of YBa2Cu3O7-delta single crystals with transport current parallel to the c axis and magnetic field up to 12 T applied along the CuO2 layers. Vortex-glass behavior is found for both rho(zx)(T) and rho(zz)(T) at small resistivities. A scaling relation has been observed between rho(zx) and rho(zz) over a range in the B-T phase diagram that extends beyond the vortex-glass critical regime. rho(zx)(T) is negative at all temperatures around T-c, demonstrating the absence of a relation between scaling and a change of sign of the Hall resistivity.