Superconducting nanowire quantum interference device based on Nb ultrathin films deposited on self-assembled porous Si templates

TL;DR

This paper reports on the observation of magnetoresistance oscillations in networks of ultrathin Nb nanowires, revealing insights into thermal and quantum phase slips and coherence in superconducting nanostructures.

Contribution

It introduces a superconducting nanowire quantum interference device based on Nb ultrathin films on self-assembled porous Si templates, highlighting new coherence phenomena.

Findings

Magnetoresistance oscillations observed in Nb nanowire networks

Evidence of thermal and quantum phase slips

System exhibits coherence despite fluctuations

Abstract

Magnetoresistance oscillations were observed on networks of superconducting ultrathin Nb nanowires presenting evidences of either thermal or quantum activated phase slips. The magnetic transport data, discussed in the framework of different scenarios, reveal that the system behaves coherently in the temperature range where the contribution of the fluctuations is important.