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/Φ0 where Φ0 is the flux quantum.
@article{arxiv.1105.3875,
title = {Tunnel Spectroscopy of a Proximity Josephson Junction},
author = {M. Meschke and J. T. Peltonen and J. P. Pekola and F. Giazotto},
journal= {arXiv preprint arXiv:1105.3875},
year = {2015}
}