Tilt angle dependences of vortex structure and critical current density at low-angle grain boundaries in YBa2Cu3O7-x films

A tilt angle dependence of vortex structure was studied at low-angle grain boundaries (LAGBs) in YBa2Cu3O7-x films. The 2 degrees tilt LAGB did not degrade J(c) of the film in a self-field, demonstrating the existence of Abrikosov vortices at the 2 degrees LAGB. The magnetic field dependence of the flux flow resistance indicated the existence of Abrikosov Josephson vortices at the 5 degrees tilt LAGB. At the 10 degrees tilt LAGB, a Josephson junction behavior was observed in a self-field, indicating the existence of Josephson vortices. The influence of the LAGBs on critical current density was understood based on these vortices.