Transport Measurements on Nano-engineered Two Dimensional Superconducting Wire Networks

TL;DR

This study reports on transport measurements of nano-engineered triangular Nb superconducting wire networks, revealing robust magnetoresistance oscillations and rational flux dips, consistent with theoretical predictions.

Contribution

It introduces a fabrication method for high-resistance Nb wire networks and demonstrates the first observation of rational flux dips in triangular geometries.

Findings

Magnetoresistance oscillations persist at high fields and low temperatures.

Distinct dips at rational flux values (1/2, 1/3, 1/4) observed.

Results align with theoretical models of critical temperature dependence.

Abstract

Superconducting triangular Nb wire networks with high normal-state resistance are fabricated by using a negative tone hydrogen silsesquioxane (HSQ) resist. Robust magnetoresistance oscillations are observed up to high magnetic fields and maintained at low temperatures, due to the eective reduction of wire dimensions. Well-defined dips appear at integral and rational values (1/2, 1/3, 1/4) of the reduced flux f = Phi/Phi_0, which is the first observation in the triangular wire networks. These results are well consistent with theoretical calculations for the reduced critical temperature as a function of f.