Superconducting YBa2Cu3O7-y films were fabricated by liquid phase epitaxy (LPE) on MgO (100) and NdGaO3 (110) single-crystalline substrates. The film of 10 μm thickness on the MgO substrate shows a high critical current density over 105 A/cm2 at 77.3 K. This film includes the stacking faults that were introduced due to the-large lattice mismatch between the YBCO film and the MgO substrate. We measured Jc-B characteristics of this high Jc and found the peak effect: enhancing Jc with increasing field. On the other hand, Jc of the films on the NdGaO3 substrate is comparably low, and we have a microstructure without stacking faults. These results suggest that the stacking faults in the films on MgO substrates behave as field-induced pinning centers at 77.3 K.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering