Superconducting Proximity Effect Probed on a Mesoscopic Length Scale
S. Guéron, H. Pothier, Norman O. Birge, D. Esteve, M. H. Devoret
DOI 10.1103/PhysRevLett.77.3025 · Physical Review Letters
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Abstract
We have measured by tunneling spectroscopy the electronic density of states in a nonsuperconducting wire in good contact with a superconductor, at distances of 200, 300, and 800 nm from the interface. Closest to the interface, the density of states near the Fermi energy is reduced to 55% of its normal value. At the farthest measurement point, this dip has nearly completely disappeared. We compare our data to predictions based on the Usadel equations.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Al 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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