Enhanced Vortex Pinning in YBCO Coated Conductors With BZO Nanoparticles From Chemical Solution Deposition
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Authors: Pomar, Alberto; Roxana Vlad, Valentina; Llordes, Anna; Palau, Anna; Gutierrez, Joffre; Ricart, Susagna; Puig, Teresa; Obradors, Xavier; Usoskin, Alexander
Abstract
We present our latest results on the growth of chemical solution deposited YBa2Cu3O7 - BaZrO3 nanocomposites on metallic substrates. All chemical (YBCO)-Y-TFA-BZO/(MOD)CZO/(ABAD)YSZ/SS tapes with J(c)(77K, sf) = 1.7 MA/cm(2) have been achieved with weaker field dependence of J(c) than that of standard (YBCO)-Y-TFA tapes. Angular resolved measurements show isotropic enhancement of vortex pinning due to the presence of randomly oriented BZO nanoparticles in the YBCO matrix. Chemical routes are thus a promising way to efficiently increase vortex pinning in coated conductors and improve their capabilities for high field applications.
Strong flux-pinning in epitaxial NdBa2Cu3O7-delta films with columnar defects comprised of self-assembled nanodots of BaZrO3
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Authors: Wee, S. H.; Goyal, A.; Martin, P. M.; Li, J.; Paranthaman, M.; Heatherly, L.
Abstract
Epitaxial NdBa2Cu3O7-delta (NdBCO) films with and without the incorporation of self-assembled nanodots of BaZrO3 (BZO) were grown on rolling-assisted-biaxially-textured substrates (RABiTS) by pulsed laser deposition. Compared to epitaxial YBa2Cu3O7-delta (YBCO) films on RABiTS, NdBCO films are found to have superior performance in applied fields at all field orientations, suggesting the presence of an increased density of pinning centres. The incorporation of columns of self-assembled nanodots of BZO within the NdBCO films results in further enhancement of the in-field J(c) at all field orientations. J(c) varies as J(c) similar to H-alpha at intermediate fields, with a values for NdBCO and BZO-doped NdBCO films being similar to 0.37 and similar to 0.43, respectively, which are significantly lower than alpha similar to 0.52 for YBCO film.