Journal
PHYSICAL REVIEW B
Volume 62, Issue 18, Pages 12505-12508Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.62.12505
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Data as a function of magnetic field on two types of bicrystal grain boudaries (GB's) of high-T-c superconductors show a peak in the critical current and an unusual inverse hysteresis. These results support a mechanism for an enhanced GB critical current, arising from interactions of GB vortices with pinned Abrikosov vortices in the banks of a GB, as suggested by Gurevich and Cooley. A substantial fraction of this enhancement (of order a factor of 2 after field cooling) also occurs upon exceeding the critical current of the grains after zero field cooling. A bulk GB and an isolated GB from a coated conductor show qualitatively identical results.
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