Individual grain boundary properties and overall performance of metal-organic deposition coated conductors
We have investigated single grain boundaries (GBs) isolated in coated conductors produced by metal-organic deposition. When a magnetic field is swept in the film plane, an angle-dependent crossover from boundary to grain limited critical current density J is found. In the force-free orientation, eve...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Published: |
2010
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| Summary: | We have investigated single grain boundaries (GBs) isolated in coated conductors produced by metal-organic deposition. When a magnetic field is swept in the film plane, an angle-dependent crossover from boundary to grain limited critical current density J is found. In the force-free orientation, even at fields as high as 8 T, the GBs still limit J. We deduce that this effect is a direct consequence of GB meandering. We have employed these single GB results to explain the dependence of J of polycrystalline tracks on their width: in-plane measurements become flatter as the tracks are narrowed down. This result is consistent with the stronger GB limitation at field configurations close to force-free found from the isolated boundaries. Our study shows that for certain geometries even at high fields the effect of GBs cannot be neglected. © 2010 The American Physical Society. |
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