Superconducting proximity effect through high-quality high-conductance tunnel barriers
L. Capogna, M. G. Blamire
DOI 10.1103/PhysRevB.53.5683 · Physical Review B
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Abstract
The temperature dependence of the critical current of very high-conductance Nb−AlOx−Al−AlOx−Nb tunnel junctions with thin middle Al layers (thickness dAl 2-8 nm) shows a tail above the Al critical temperature, whose amplitude strongly depends on dAl. This is interpreted as evidence of a proximity effect through tunnel barriers whose high quality and transparency can be independently assessed. These data have been modeled within the framework of the McMillan model using independently measurable barrier transmission factors, and obtaining an excellent quantitative agreement.
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 |
| 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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