Angular dependence of the Hall conductivity in YBa2Cu3Ox films with columnar defects

We have studied the role of strong pinning on the Hall conductivity by meas uring the angular dependence of the longitudinal and the Hall resistivity o f YBa2Cu3Ox films with columnar defects. The resulting Hall conductivity \s igma(xy)\ of irradiated films shows a sharp increase with decreasing temper ature when an external magnetic field is aligned parallel to the columnar d efects, a strong pinning configuration, whereas \sigma(xy)\ of unirradiated films shows a broad minimum in the same orientation. This distinctive diff erence demonstrates the pinning dependence of the Hall conductivity; [S0163 -1829(98)04446-4].