Superconducting Tunneling in Ultrathin Nb Films
Sung I. Park, T. H. Geballe
DOI 10.1103/PhysRevLett.57.901 · Physical Review Letters
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Abstract
Good-quality tunnel junctions have been fabricated on ultrathin films of Nb whose thicknesses ranged from 9 to 900 Å. As the film thickness is reduced below 50 Å, Tc decreases, 2ΔkTc increases, and mode softening is observed through d2VdI2 measurements. These results imply that as the thickness decreases below 50 Å the electron-phonon constant, λ, becomes larger than expected from the drop in Tc.
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. | 5.7 | Pressure not reported | midpoint |
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | Pressure not reported | midpoint |
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