SUPERCONDUCTING Y1BA2CU3O7-X ND1.85CE0.15CUO4-Y BILAYER THIN-FILMS/

Bilayers of Y1Ba2Cu3O7-x(YBCO)/Nd1.85Ce0.15CuO4-y(NCCO), in which both layers were superconducting, were fabricated in situ by pulsed laser deposition. Using N2O as the reactive gas, we were able to meet the co nflicting processing requirements, oxygenation for YBCO, and reduction for NCCO, in the same sample with a specific cooling procedure. The b ilayer thin films were c-axis oriented with a transition temperature, T(co), of 88.5 K for YBCO and 18.5 K for NCCO. Supercurrent was observ ed across the interface of the YBCO and NCCO superconducting layers, i ndicating the phase coherence between these superconductors.