YBCO/metallic oxide/YBCO trilayers for high-T/sub c/ superconducting SNS junctions

摘要

Some metallic oxides are prospective barrier materials for high-T/sub c/ superconducting SNS junctions. Among them, SrVO/sub 3/ is a metallic oxide with a bulk resistivity of 1-1000 /spl mu//spl Omega/-cm and a cubic perovskite-type crystal structure. The lattice constant of SrVO/sub 3/ is 3.84 /spl Aring/ which is close to that of the high-T/sub c/ superconductor YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO, a=3.82 /spl Aring/, b=3.89 /spl Aring/). We report the fabrication of metallic SrVO/sub 3/ thin films and YBCO/SrVO/sub 3//YBCO trilayers using pulsed laser ablation. The crystal structure and surface morphology of the films were studied by X-ray diffraction and AFM. The electrical properties of the films were measured by the standard four probe method. The potential application of SrVO/sub 3/ thin films for the barriers of high-T/sub c/ superconducting SNS junctions is discussed.