Superconducting and non-superconducting oxide multilayers

An overview of perovskite-related metallic oxides and their thin films is presented with an emphasis on the epitaxial growth of $LaNiO_3$ thin films on a variety of substrates. Using these films as metallic barrier layers, $YBa_2Cu_3O _{7-\delta}/LaNiO_3/YBa_2Cu_3O_{7-\delta}/SrTiO_$3 trilayer superconductor-normal metal (metallic oxide)-superconductor junctions have been fabricated. The results indicate that the coherence length of electrons in the normal metal $LaNiO_3$ region is of the order of 125 \AA. Besides, the growth of a-axis-oriented $LaBa_2Cu_{2.8}Ni_{0.2}O_{7+\delta}$ metallic thin films is reported which can be used as a promising template to grow a-axis-oriented overlayers required preferably in the fabrication of multilayer device