Enhancement of the supercurrent at a finite voltage in a sandwich-type ballistic SINIS junction.
A large, reentrant, Josephson current is observed in SINIS (Nb/Al/AlOx/Al/AlOx/Al/Nb) junctions at a finite voltage close to Delta/e (where Delta is the superconducting energy gap in S) and a bias current exceeding the zero-voltage Josephson current. The effect is studied using a multiterminal device configuration. A theoretical interpretation in terms of quantized electron states in the N layer is provided.
Nevirkovets
I P
IP
Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA.
Shafranjuk
S E
SE
Chernyashevskyy
O
O
Ketterson
J B
JB