Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 36, Issue 12, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6668/acff25
Keywords
high temperature superconductor; (Y,Dy)Ba2Cu3O7-delta nanocomposite; BaZrO3; nanoparticle; flux pinning
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In this study, monodisperse BaZrO3 (BZO) nanocrystals were successfully introduced into superconducting tapes as effective pinning centers. The superconducting performances of BZO-added tapes were systematically investigated and it was found that the 5% BZO addition showed the best performance. The BZO addition strategy can be extended to different types of samples and is valuable for in-field applications.
In the present work, monodisperse BaZrO3 (BZO) nanocrystals with controllable sizes are successfully introduced into trifluoroacetate metal-organic deposition derived (Y,Dy)Ba2Cu3O7-delta ((Y,Dy)BCO)-coated superconducting tapes to act as effective pinning centers. The BZO nanocrystal addition strategy is extended to upscaling coated conductors as long as hundreds of meters, and as thick as 3.4 mu m, of (Y,Dy)BCO layers. The corresponding superconducting performances of BZO-added (Y,Dy)BCO-coated conductors are systematically investigated under various applied magnetic fields and temperatures. It is revealed that the I-c (77 K, self-field) of BZO-added tapes decreases linearly with BZO concentration, while the corresponding in-field lift-factors increase for all studied BZO additions. In-field J(c) values under various fields at low temperatures show that the (Y,Dy)BCO tape with 5%-BZO addition exhibits a better performance than that of other concentrations. Besides, this benefit of BZO addition appears identical for both thin and thick samples, as well as for tapes that are hundreds of meters long. The angular dependence of in-field I-c also shows that significant improvement occurs in all the studied angular ranges after nanocrystal BZO additions, demonstrating that the nanocrystal addition strategy is of great value for upscaling commercial (Y,Dy)BCO tape for in-field applications.
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