Nonequilibrium supercurrent transport in controllable superconductor–normal-metal–superconductor junctions
J. J. A. Baselmans, B. J. van Wees, T. M. Klapwijk
DOI 10.1103/PhysRevB.63.094504 · Physical Review B
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Abstract
We study the supercurrent through a superconductor (Nb)–normal-metal (Ti-Au bilayer)–superconductor junction as a function of the electron distribution in the normal region. The normal region of the junction is coupled to the center of a mesoscopic wire (control channel) over which a control voltage Vc can be applied. The effective electron-electron relaxation in the wire determines the shape of the electron distribution and therefore the critical current of the SNS junction. For a short (1 μm) control channel we observe the transition to a π state of the junction whereas for a junction with a long (9 μm) control channel we observe a monotonic decrease of the critical current. The data are in good quantitative agreement with theory at higher energies, but at low energies important geometry dependent deviations arise. The inferred electron-electron interaction time in the normal metal τe−e equals 10 ps.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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