BaSnO3 is proposed as a new insulating material for YBCO-SIS tunnel junctions from the viewpoint of the superconducting behavior of a layer-structured YBCO. YBCO and BaSnO3 thin films were grown in-situ by a reactive co-evaporation in oxygen radicals. XRD, AFM, and RHEED observations confirm that (001) oriented YBCO and (100) oriented BaSnO3 thin films grow epitaxially on each other. Cross-sectional TEM observations reveal that about 4 nm thick BaSnO3 thin films perfetly cover the lower YBCO thin film surface steps with a height of one unit cell length of YBCO. Tc of the lower and upper YBCO thin films is higher that 80 K.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering