Subgap Structure as Function of the Barrier in Atom-Size Superconducting Tunnel Junctions
N. van der Post, E. T. Peters, I. K. Yanson, J. M. van Ruitenbeek
DOI 10.1103/PhysRevLett.73.2611 · Physical Review Letters
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Abstract
Using a mechanically controllable breakjunction we study superconducting tunnel junctions of atom size. The vacuum barrier is adjusted by controlling the distance between the electrodes to give barrier transparencies ranging over 2 orders of magnitude. We observe a systematic variation of the subgap current steps at eV=2Δn, for n=2 and n=3 in excellent agreement with theories of multiparticle tunneling and multiple Andreev reflection.
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 |
| Pb 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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