Anomalous density of states in a metallic film in proximity with a superconductor

Details Anomalous density of states in a metallic film in proximity with a superconductor Anomalous density of states in a metallic film in proximity with a superconductor

2003-12-04

arxiv.org/abs/cond-mat/0312126v1

Phys. Rev. B 69, 104514 (2004)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.69.104514

We investigated the local electronic density of states in superconductor-normal metal (Nb-Au) bilayers using a very low temperature (60 mK) STM. High resolution tunneling spectra measured on the normal metal (Au) surface show a clear proximity effect with an energy gap of reduced amplitude compared to the bulk superconductor (Nb) gap. Within this mini-gap, the density of states does not reach zero and shows clear sub-gap features. We show that the experimental spectra cannot be described with the well-established Usadel equations from the quasi-classical theory.

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