Current direction dependence of vortex pinning in (103)/(013) oriented YBCO films

The electrical and the superconducting properties of (103)/(013) oriented Y BCO films were investigated as a function of the angle of incidence of the current with respect to the in-plane orientation of the film lattice. Unidi rectional twin boundary defects are expected to occur in the film, resultin g in the observed anisotropy gamma of the resistivity in normal state. Also the current-voltage (V-I) characteristics are affected by the current dire ction. In this case CuO layer intrinsic pinning is argued to be the origin of the observed behavior.