YBa2Cu3O7-x+Y2O3 (YBCO+Y2O3) mixed films were prepared on SrTiO 3/MgO substrates by pulsed-laser deposition from a YBCO target with a thin Y2O3 sector on the top. The pinning properties for the mixed YBCO+Y2O3 thin film were strongly enhanced, especially at the temperatures lower than 77K: the maximum global pinning forces FP for the Y2O3 doped sample are 7.8GNm -3 near 2T at 77K, 54.5GNm-3 near 4T at 65K, and 189GNm-3 near 9T at 40K. In the Y2O3-added samples, except for the plane configuration, the angular dependence of J c showed a plateau, due to the flux pinning by isotropic pinning centres. Y2O3 nanoparticles randomly dispersed inside the YBCO matrix were consistently observed in the cross-sectional TEM images.
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