Abstract
Magnetooptical imaging has been used to investigate low-angle grain boundaries (LAGB's) in YBCO thin films at T = 5K. This technique allows us to visualize the flux density distribution with a spatial resolution of a few micrometers. By a numerical analysis of the experimental data the local current distribution in a LAGB has deen determined. It is shown that the current density acros the grain boundary depends strongly on the local flux density which leads to a crossover in the pinning scenario at the LAGB.
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