Individual grain boundary properties and overall performance of metal-organic deposition coated conductors

Article

关键词: YBCO FILMS;    TRANSPORT MEASUREMENTS;    SUPERCONDUCTING TAPES;    CRITICAL CURRENTS;    YBA2CU3O7-DELTA;    DENSITY;    MICROSTRUCTURE;   

DOI  :  10.1103/PhysRevB.81.174537

来源: SCIE

【 摘 要 】

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(c) 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.

【 授权许可】

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