Abstract
We consider a Josephson junction the superconducting electrodes of which are in contact with normal metal reservoirs ( means a barrier). For temperatures near we calculate an effective critical current and the resistance of the system at the currents and . It is found that the charge imbalance, which arises due to injection of quasiparticles from the reservoirs into the wire, affects essentially the characteristics of the structure. The effective critical current is always larger than the critical current in the absence of the normal reservoirs and increases with decreasing the ratio of the length of the wire to the charge imbalance relaxation length . It is shown that a series of peaks arises on the characteristics due to excitation of the Carlson-Goldman collective modes. We find the position of Shapiro steps which deviates from that given by the Josephson relation.
- Received 26 July 2007
DOI:https://doi.org/10.1103/PhysRevB.76.174502
©2007 American Physical Society