Enhancement of Critical Current Density in the (YBa2 Cu3O7-δ/Y 2O3 ) ×N Multilayered Films

Abstract

The enhancement of critical current density (Jc) in the (YBa2Cu3O7-δ(YBCO)/Y2O3) ×N multilayered films was reported. The (YBCO/Y2O3) ×N multilayered films in which N was varied from 0 to 10 were prepared by using the pulsed laser deposition (PLD) technique. Magnetization data measured at 65 K showed that Jcof the (YBCO/Y2O3) ×N multilayered films was enhanced in comparison with that of the pure YBCO film. More interestingly, the Jcenhancement was obtained to increase at small values of N, reach the maximum at N = 5, then decrease with increasing N to 10. The Jcenhancements in the (YBCO/Y2O3) ×N multilayered films with N ≤5 were attributed to the increases in the number of single YBCO layers. The microstructure degradation in the (YBCO/Y2O3) ×N multilayered filmswith N > 5 was likely to be reason for the decreases in their Jc, which was confirmed by using the scanning electron microscopy (SEM) images