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Grain boundary transport properties in YBa2Cu3Ox coated conductors

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6 Author(s)
Berghuis, P. ; Div. of Mater. Sci., Argonne Nat. Lab., IL, USA ; Miller, D.J. ; Kim, D.H. ; Gray, K.E.
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Critical current data obtained as a function of magnetic field on an isolated grain boundary (GB) of a coated conductor and two other types of bicrystal GBs of YBa2Cu3Ox show a peak in the critical current and an unusual hysteresis. These results provide support for a new mechanism for enhanced GB critical currents, arising from interactions of GB vortices with pinned Abrikosov vortices in the banks of a GB, as suggested by Gurevich and Cooley (1994). A substantial fraction of this enhancement, which can exceed a factor of ten, also occurs upon surpassing the critical current of the grains after zero field cooling. A bulk GB and thin film GBs show qualitatively identical results

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Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )