Abstract
Magnetic Hall probe microscopy in combination with an inverse problem solver was used tosimultaneously determine the intragranular and intergranular critical current density dependenceson the applied field of YBCO melt-textured welds with [001]-misorientation angles from0° to30°. This methodology enabled us to investigate the pinning mechanisms of grain boundaryvortices, which evolve from Abrikosov vortices (AVs) to Abrikosov–Josephson vortices(AJVs) and then to Josephson vortices (JVs) as the angle increases. We present a magneticfield versus grain boundary angle phase diagram at 77 K in which different intergrain vortexmotion regimes can be identified.
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