Abstract
Low-angle grain boundaries with misorientation angles in optimally doped thin films of are investigated by magneto-optical imaging. With a numerical inversion scheme of Biot-Savart’s law it is possible to obtain the critical current density across the grain boundary with a spatial resolution of about This technique is now applied to determine the temperature dependence of the critical current density across low-angle grain boundaries. The detailed analysis of the temperature dependence shows a crossover in the pinning properties of Abrikosov-Josephson vortices which are located in the grain boundary.
- Received 16 December 2002
DOI:https://doi.org/10.1103/PhysRevB.68.054508
©2003 American Physical Society