Josephson effects in a superconductor-normal-metal mesoscopic structure with a dangling superconducting arm

We studied a mesoscopic crosslike normal-metal structure connected to two s uperconducting (S) and two normal (N) reservoirs. We observed the Josephson effect under unusual conditions when there is no current through one of th e two S/N interfaces. The potential difference between the S reservoirs was zero unless the voltage applied between S and N reservoirs exceeded a crit ical value although the electric potential in the N wire connecting the sup erconductors varied in a nonmonotonic way. The observed effects are discuss ed theoretically.