Phase states of multiterminal mesoscopic normal-metal-superconductor structures.
We study a mesoscopic normal-metal structure with four superconducting contacts, two of which are joined into a loop. The structure undergoes transitions between three (meta)stable states, with different phase configurations triggered by nonequilibrium conditions. These transitions result in spectacular changes in the magnetoresistance. We find a qualitative agreement between the experiments and a theory based on the quasiclassical Keldysh formalism.
Virtanen
P
P
Low Temperature Laboratory, Helsinki University of Technology, P.O. Box 3500, FIN-02015 TKK, Finland.
Zou
J
J
Sosnin
I
I
Petrashov
V T
VT
Heikkilä
T T
TT