We calculate current-phase relation (CPR) of a SN-S-SN Josephson junction based on a variable thickness SN bilayer composed of highly disordered superconductor (S) and low-resistive normal metal (N) with proximity induced superconductivity. In case when the thickness of S,N layers and length of S constriction is about of superconducting coherence length the CPR is single-valued, could be close to sinusoidal one and the product IcRn can reach Δ(0)/2∣e∣ (Ic is the critical current of the junction, Rn is its normal-state resistance, Δ(0) is the superconductor gap of single S layer at zero temperature). We argue that the normal layer should provide good heat removal from S constriction and there is range of parameters when current-voltage characteristic is not hysteretic and IcRn is relatively large.
@article{arxiv.2002.07552,
title = {Josephson junction based on highly disordered superconductor/low-resistive normal metal bilayer},
author = {P. M. Marychev and D. Yu. Vodolazov},
journal= {arXiv preprint arXiv:2002.07552},
year = {2020}
}