Enhancement and angular dependence of transport critical current density in pulsed laser deposited YBa2Cu3O7-x+BaSnO3 films in applied magnetic fields
Abstract
YBa2Cu3O7-x (YBCO) films with nanoparticles of BaSnO3 (BSO) were processed using pulsed laser ablation of a special target made with dual phase sectors of YBCO and BSO. Transport critical current density (Jct) of these YBCO +BSO films in applied magnetic fields and angular dependence of Jct on the applied field orientation was measured. It was observed that in the YBCO +BSO films, the Jct (H ‖c orientation) increased considerably as compared to regular YBCO films and was 1.3 times higher than Jct in H ‖ab orientation. Cross-sectional transmission electron microscopy images on YBCO +BSO films showed the presence of high density (3.5×1011cm-2) of nanoparticles (∼10nm size) and nanocolumns that extended throughout the thickness of the films with high density of dislocations and stacking faults (1000μm-2). The observed results of enhancements in Jct in H ‖c and Jct in H ‖ab orientations were discussed in the light of the observed microstructural details.
- Publication:
-
Journal of Applied Physics
- Pub Date:
- September 2007
- DOI:
- 10.1063/1.2783783
- Bibcode:
- 2007JAP...102f3909V
- Keywords:
-
- 74.78.Bz;
- 74.72.Bk;
- 74.25.Sv;
- 81.15.Fg;
- 61.72.Ff;
- 61.72.Nn;
- High-T<sub>c</sub> films;
- Y-based cuprates;
- Critical currents;
- Laser deposition;
- Direct observation of dislocations and other defects;
- Stacking faults and other planar or extended defects