Physics – Condensed Matter – Superconductivity
Scientific paper
2010-04-13
Physical Review B vol 81, art-no 174537 (2010)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.81.174537
We have investigated single grain boundaries (GBs) isolated in coated conductors produced by Metal-Organic Deposition (MOD). When a magnetic field is swept in the film plane, an angle-dependent crossover from boundary to grain limited critical current density Jc is found. In the force-free orientation, even at fields as high as 8 T, the GBs still limit Jc. We deduce that this effect is a direct consequence of GB meandering. We have employed these single GB results to explain the dependence of Jc 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.
Durrell J. H.
Grovenor C. R. M.
Hughes G. M.
Lozano-Perez S.
Rutter N. A.
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