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

Abstract

We analyse the measured critical current $I_m$ 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 $I_c\sin \varphi ,$ but also a phase-coherent part $I_{sg}\cos \varphi$ 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.

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

References in corpus (2)

• Observation of supercurrent enhancement in SNS junctions by non-equilibrium injection into supercurrent carrying bound Andreev states
• Anomalous behaviour of S/N mesoscopic structures near T_c

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