Scaling of the Hall resistivity in the solid and liquid vortex phases in twinned single-crystal YBa2Cu3O7-δ

Longitudinal and Hall voltages are measured in a clean twinned YBa2Cu3O7-delta single crystal in the liquid and solid vortex phases. For magnetic fields tilted away from the c axis more than about 2 degrees, a scaling law \rho(xy)\ = Ap(xx)(beta) with beta approximate to 1.4 is observed, which is unaffected by the vortex-lattice melting transition. The vortex-solid Hall conductivity is nonlinear and diverges to negative values at low temperature. When the magnetic field is aligned to the c axis, the twin-boundary correlated disorder modifies the scaling law, and beta approximate to 2. The scaling law is unaffected by the Bose-glass transition. We discuss the scaling behavior in terms of a dimension-dependent percolation theory. The twin-boundary guided vortex motion is also investigated.