YBa2Cu3O7-x + BaZrO3 + Y2O3 (YBCO + BaZrO3 + Y2O3) mixed films were prepared on SrTiO3/MgO substrates by pulsed-laser deposition from an YBCO + BaZrO3 target with a thin Y2O3 sector stuck on the top. The pinning properties for the double-doped YBCO + BaZrO3 + Y2O3 thin film were enhanced in comparison with a pure YBCO sample prepared in the same experimental conditions. The maximum global pinning forces FP for the double-doped sample are 12.8 GN/m3 at 77K, 46.3 GN/m3 at 65K, and 122 GN/m3 at 40K. In the double-doped sample, the angular dependence of Jc showed a broad peak at B//c due to the flux pinning by c-axis correlated defects, combined with a plateau, due to the flux pinning by isotropic pinning centres. Consistently, both BaZrO3 nanorods parallel to the c-axis and Y2O3 nanoparticles randomly dispersed inside the YBCO matrix were observed in TEM images.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering