Spectral characteristics of a fully-superconducting SQUIPT

TL;DR

This paper investigates the spectral properties of a fully superconducting SQUIPT device, analyzing how the density of states varies with phase gradient, junction length, and interface transparency for magnetic flux sensing.

Contribution

It provides a detailed theoretical analysis of the density of states in a fully superconducting SQUIPT, highlighting factors affecting its performance as a magnetic flux sensor.

Findings

Density of states depends on phase gradient and junction parameters.

Interface transparency influences spectral characteristics.

Optimal conditions for flux detection are identified.

Abstract

We consider properties of a fully superconducting variant of the superconducting quantum interference proximity transistor magnetic flux sensor. We study the density of states in a finite-size superconducting metal wire in the diffusive limit, and how it depends on the phase gradient of the order parameter. We describe the dependence on the junction length and interface transparency, and discuss properties relevant for using the structure in magnetic flux detection applications.