<i>J</i>_cimprovement by double artificial pinning centers of BaSnO₃nanorods and Y₂O₃nanoparticles in YBa₂Cu₃O₇coated conductors

Abstract

Double artificial pinning centers of BaSnO3 nanorods and Y2O3 nanoparticles were investigated in YBa2Cu3O7 films on textured substrates prepared using ion beam assisted deposition. The BaSnO3 and Y2O3 content was varied in pulsed laser deposition. Transmission electron microscopy observation revealed the systematic change in density of the BaSnO3 nanorods and the Y2O3 nanoparticles in the films. In YBa2Cu3O7 + BaSnO3 films, maximum global pinning force (Fp,max) was improved at high magnetic fields, and Fp,max was shifted to high magnetic field by the Y2O3 incorporation due to an increase in density of the pinning centers. The angular dependences of critical current density (Jc) in the YBCO + BaSnO3 films were tuned by introducing Y2O3, and some of the YBa2Cu3O7 + BaSnO3 + Y2O3 films exhibited isotropic Jc behavior at low magnetic field. The double artificial pinning centers of BaSnO3 nanorods and Y2O3 nanoparticles are effective in improving Jc angular dependences, Jc values at high magnetic fields, and Fp,max.