Superconducting networks with the proximity effect

TL;DR

This paper presents the first observation of a superconducting proximity network with a superconductor-normal metal bilayer, revealing edge-dominated supercurrent flow and vortex arrangements similar to monolayer networks.

Contribution

It introduces a novel superconducting proximity network using a superconductor-normal metal bilayer and demonstrates edge-based supercurrent flow and vortex pattern similarities to monolayer networks.

Findings

Supercurrent flows along the network edges rather than the center.

Multiple peaks observed in power spectrum analysis.

Vortex arrangements in the proximity network resemble those in monolayer networks.

Abstract

We report on the first observation of a novel type of superconducting proximity network using a superconductor-normal metal bilayer. Little-Parks oscillation measurements show that the superconducting current flows through a path enclosed by the edge rather than by the center of the Pb/Au wire in the network. Furthermore, several peaks were observed in a power spectrum analysis. We observed that the sequence of these peaks and that of the monolayer network were connected by the power function, which is a factor of the line width, S_{B_n} = \alpha^{n-2}S_{A_n}. This suggests that even in a proximity network vortices are arranged in a way identical to a monolayer network.