Y-Ba-Cu-O and Bi-Sr-Ca-Cu-O epitaxial films were cleaved in the stream of evaporating noble metals such as Au, Ag and Pt to form well defined SN interfaces. All of interfaces showed a contact resistance in the range of 10−9 Ωm, which is much higher than that of metal/metal interfaces. Anisotropy in contact resistance was observed with Rc ‖ /Rc⊥~15. A pin-hole like phenomenological interface model is given. Several microscopic origins of a such interfacial barrier are discussed. Josephson current was not observed in SNS' junctions made on these interfaces. This is attributed to the small Josephson energy limited by the pin-hole like channels.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering