Josephson current in nanofabricated V/Cu/V mesoscopic junctions

TL;DR

This paper reports on the fabrication and analysis of V/Cu/V mesoscopic Josephson junctions, demonstrating their superconducting properties and potential for nanodevice applications at a few kelvins.

Contribution

It presents the successful fabrication and low-temperature characterization of V/Cu/V Josephson junctions, showing their viability for superconducting nanodevices.

Findings

Critical currents of tens of microA at 350 mK

Josephson coupling persists up to ~2.7 K

Good agreement with diffusive regime model

Abstract

We report the successful fabrication of planar V/Cu/V mesoscopic Josephson weak-links of different size, and the analysis of their low-temperature behavior. The shorter junctions exhibit critical currents of several tens of microA at 350 mK, while Josephson coupling persists up to ~2.7 K. Good agreement is obtained by comparing the measured switching currents to a model which holds in the diffusive regime. Our results demonstrate that V is an excellent candidate for the implementation of superconducting nanodevices operating at a few kelvins.