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

Department of Microelectronics and Nanoscience, Chalmers University of TechnologySE-412 96 Goteborg, Sweden(July 11, 2011)We studied a mesoscopic cross-like normal metal structure connected to two superconducting(S) and two normal (N) reservoirs. We observed the Josephson effect under unusual conditionswhen there is no current through one of the two S/N interfaces. The potential difference betweenthe S reservoirs was zero unless the voltage applied between S and N reservoirs exceeded a criticalvalue although the electric potential in the N wire connecting the superconductors varied in anonmonotonic way. The observed effects are discussed theoretically.PACS number: 74.50.+r, 73.23.-b, 85.25.-j