Abstract
Superconducting electrical transport across single grain boundaries (GBs) in YBCO shows interesting behavior in substantial magnetic fields. Measurements on [001] tilt bicrystal YBCO thin films in strong magnetic fields are consistent with the following: Low-angle GBs (<10/spl deg/) are composed of well-ordered bridges that act as strong superconducting inter-granular links; large-angle GBs exhibit weak coupling behavior that retains a well defined critical current even at high field.
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