Three-terminal double-junction Nb/Al-AlOx-Nb/Al-AlOx-Nb tunnel devices with a thin (≈ 13 nm) Nb/Al middle layer have been investigated. Strong interaction between the two junctions has been observed, as a result at zero voltage the system can behave like a single junction with one critical current. This state is stable and can be characterized by identical phase distributions for the two junctions. At some value of the applied magnetic field, a transition to another state occurs, in which the individual junctions behave relatively independently.
ASJC Scopus subject areas
- Physics and Astronomy(all)