Enhancement and angular dependence of transport critical current density in pulsed laser deposited YBa2Cu3O7-x+BaSnO3 films in applied magnetic fields

Varanasi, C. V.; Burke, J.; Brunke, L.; Wang, H.; Sumption, M.; Barnes, P. N.
September 2007
Journal of Applied Physics;Sep2007, Vol. 102 Issue 6, p063909
Academic Journal
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 (3.5×1011 cm-2) of nanoparticles (∼10 nm size) and nanocolumns that extended throughout the thickness of the films with high density of dislocations and stacking faults (1000 μm-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.


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