ANISOTROPIC HALL-MOBILITY IN SLIGHTLY OVERDOPED YBA2CU3O6.92 FROM MAGNETORESISTANCE AND HALL-COEFFICIENT MEASUREMENTS

Hall mobilities of slightly overdoped YBa2Cu3O6.92 crystals were evalu ated from the measurements of the in-plane magnetoresistance (MR) and the Hall effects. While MR for H parallel to c is consistently underst ood in tc rms of the in-plant Hall mobility. MR for H parallel to ab h as shown no detectable orbital contribution, which strongly suggests t hat the Hall mobility involving the c-axis hopping is seriously suppre ssed. The Hall conductivities are found to be also highly anisotropic, and the anisotropy becomes larger with decreasing temperature, as is similar to the anisotropy of the dc resistivity.