Subgap structure in asymmetric superconducting tunnel junctions
Markus Ternes, Wolf-Dieter Schneider, Juan-Carlos Cuevas, Christopher P. Lutz, Cyrus F. Hirjibehedin, Andreas J. Heinrich
DOI 10.1103/PhysRevB.74.132501 · Physical Review B
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Abstract
Conductance measurements between two superconducting electrodes with different gap energies Δ1 and Δ2 were performed with a low-temperature scanning tunneling microscope. The temperature dependence and tip-sample distance dependence of the spectra show a pronounced subgap structure which is interpreted as multiple Andreev reflections (MARs). Low temperature conductance peaks not seen in symmetric superconducting tunnel junctions arise at energies ±∣Δ1−Δ2∣ when the superconducting gaps are sufficiently different. We propose an explanation of these findings by extending the full counting statistics of MARs to describe these asymmetric junctions.
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. | 2.1 | Pressure not reported | unknown |
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