Spatially resolved spectroscopy on superconducting proximity nanostructures
M. Vinet, C. Chapelier, F. Lefloch
DOI 10.1103/PhysRevB.63.165420 · Physical Review B
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Abstract
We investigated the local density of states (LDOS) of a normal metal (N) in good electrical contact with a superconductor (S) as a function of the distance x to the NS interface. The sample consists of a pattern of alternate strips of Au and Nb. We used a low-temperature scanning tunneling microscope to record simultaneously dI/dV(V,x) curves and the topographic profile z(x). Nearby the NS interface, all the spectra show a dip at the Fermi energy but, depending on the geometry, different behaviors can be distinguished. First, when the characteristic size of the normal metal L is much larger than the coherence length ξN=ħDN/2Δ, the spectral extension of the dip decreases from Δ at the NS interface to zero at distances x≫ξN. Second, when L is comparable to ξN, the apparent gap in the LDOS is space independent.
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. | 8.1 | Pressure not reported | onset |
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