Abstract
YBa2Cu3O7−x+BaZrO3+Y2O3 (YBCO+BaZrO3+Y2O3) mixed filmswere prepared on SrTiO3/MgO substrates by pulsed-laser deposition, with anYBCO+BaZrO3 targetwith a thin Y2O3 sector stuck on the top. The pinning properties for the double-dopedYBCO+BaZrO3+Y2O3 thin film were enhanced in comparison with those of a pure YBCO sample preparedin the same experimental conditions. The maximum global pinning forcesFp for the double-dopedsample are 12.8 GN m−3 near3 T at 77 K, 46.3 GN m−3 near4 T at 65 K, and 122 GN m−3 near 9 T at 40 K. In the double-doped sample the angular dependence ofJc showed a broad peak at , due to the flux pinning by c-axis correlated defects, combined with a plateau, due to the flux pinning by isotropic pinning centers. BothBaZrO3 nanorodsparallel to the c-axis and Y2O3 nanoparticles randomly dispersed inside the YBCO matrix were consistently observed inthe cross sectional transmission electron microscopy images.
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