Tunnel Spectroscopy of a Proximity Josephson Junction

Details Tunnel Spectroscopy of a Proximity Josephson Junction Tunnel Spectroscopy of a Proximity Josephson Junction

2011-05-19

arxiv.org/abs/1105.3875v1

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

We present tunnel spectroscopy experiments on the proximity effect in lateral superconductor-normal metal-superconductor (SNS) Josephson junctions. Our weak link is embedded into a superconducting (S) ring allowing phase biasing of the Josephson junction by an external magnetic field. We explore the temperature and phase dependence of both the induced mini-gap and the modification of the density of states in the normal (N) metal. Our results agree with a model based on the quasiclassical theory in the diffusive limit. The device presents an advanced version of the superconducting quantum interference proximity transistor (SQUIPT), now reaching flux sensitivities of 3 nA$/\Phi_0$ where $\Phi_0$ is the flux quantum.

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