ANGULAR-DEPENDENCE OF MAGNETORESISTANCE AND CRITICAL CURRENT-DENSITY OF SPUTTERED YBA2CU3O7-DELTA FILMS

Superconducting YBa2Cu3O7-delta films were prepared by DC-sputtering o n single crystal SrTiO3 substrates. The angular dependence of the magn etoresistance and the critical current density of these films were mea sured for different magnetic fields and temperatures. The anisotropy o f the dissipation was investigated in high as well as in low magnetic fields. The results show the measured properties of the YBa2Cu3O7-delt a films strongly dependent on the tilt angle theta between the magneti c field and the ab-plane of the film due to the anisotropy of the laye red superconductor in the mixed state. Furthermore the phi-dependence is discussed with phi being the angle between the current direction an d the theta-rotation plane.