Suppression and enhancement of the critical current in multiterminal S/N/S mesoscopic structures

Details Suppression and enhancement of the critical current in multiterminal S/N/S mesoscopic structures Suppression and enhancement of the critical current in multiterminal S/N/S mesoscopic structures

2000-02-14

arxiv.org/abs/cond-mat/0002210v1

Physics

Condensed Matter

Superconductivity

4 page, 3 figures. To be puplished in PRB Rapid com

Scientific paper

10.1103/PhysRevB.61.R9273

We analyse the measured critical current $I_{m\text{}}$ in a mesoscopic 4-terminal S/N/S structure. The current through the S/N interface is shown to consist not only of the Josephson component $I_{c}\sin \phi ,$ but also a phase-coherent part $I_{sg}\cos \phi $ of the subgap current. The current $I_{m}$ is determined by the both components $I_{c}$ and $I_{sg},$ and depends in a nonmonotonic way on the voltage $V$ between superconductors and normal reservoirs reaching a maximum at $V\cong \Delta /e$. The obtained theoretical resultas are in qualitative agreement with recent experimental data.

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