In-plane anisotropic properties of (103)/(013) and 10/spl deg/ YBCO thin films

There is much current interest in fabricating structures including microbridges and vortex flow devices from high T_c thin films with high in-plane electrical anisotropy. Two types of film have been studied, films grown on 10° vieinaliy cut SrTiO₃, and (013)/(103) oriented films grown on (110) SrTiO₃ substrates in a two-temperature growth process. The 10° films have a normal state anisotropy of 3-6 (100K) dependent on film thickness . The l0Onm (013)/(103) films have a normal state anisotropy of 23 (1OOK). We report wide ranging I-V measurements taken over a range of temperatures and applied magnetic fields for both the normal and superconductings states for these films. This data is used to investigate the anisotropy below T_c both in the linear (flux-flow) regime and in the non-linear (iireversibility) regime at lower temperatures and higher currents.