Step-edge Josephson junctions on multilayered high temperature superconducting thin film
Application of Josephson effect in sensors, electronicand metrological devices working at temperature of 77 K requiresfabrication of efficient and reproducible high temperature superconducting(HTS) Josephson junctions. In order to enhancethe performance of HTS junctions, we introduce multilayeredapproach to YBCO-based step-edge Josephson junction manufacture.Thin YBCO and multilayered YBCO/NdBCO/YBCO filmsof a similar thickness (~210 nm) were grown by a pulsed-laserdeposition technique on MgO (100) substrates with artificiallycreated step edge. Large discrepancies of Ic and Rn values werefound between these two types of junction. Results of their structuraland electrical properties are reported.