Nanoparticle dispersions of various phases were added to YBa 2Cu3O7-d (YBCO or 123) thin films by multilayer pulsed laser deposition, to determine their effect on flux pinning. The different pinning materials examined include Y2BaCuO2 (Y211 or green-phase), La2BaCuO5 (La211 or brown-phase), Y2O3, CeO2, and MgO, with lattice constant mismatches varying from 0.5% to 12% with respect to YBCO. Y211 and Y 2O3 provided significant pinning increases at temperatures of 65 K and 77 K, however other phases provided enhancements only at 65 K (for CeO2 and La211) for limited range of applied field strengths. An interesting correlation between Tc transition widths and pinning strengths was observed. The additions produced markedly different nanoparticle and film microstructures, as well as superconducting properties.
- Flux pinning
- High temperature superconductor
- YBa CuO thin film