Vortex transfer mechanisms in C-oriented YBCO films with small-angle-boundaries

The mechanism of vortex depinning and motion along the row of parallel equidistant linear pins in an anisotropic type-II superconductor is considered, The essential role of the surface effects for these processes is emphasized, The activation energy of vortex motion and the critical current value are calculated for the current flow perpendicular to this row. We suppose this model to be applicable for description of resistive properties and the critical current dependence on the azimuthal misorientation angle between neighboring grains for YBCO bicrystals and rather thick c-oriented films with low-angle tilt grain boundaries, containing edge dislocations, which are parallel to the c-axis.