Experimental and Theoretical Study on 2D Ordered and 3D Disordered SIS-type Arrays of Josephson Junctions

TL;DR

This study combines experimental and theoretical approaches to analyze the temperature and magnetic field effects on AC susceptibility in highly ordered 2D and disordered 3D Josephson junction arrays, revealing the influence of non-uniform critical currents and remanent magnetization.

Contribution

It provides new insights into the magnetic behavior of Josephson junction arrays by examining both ordered and disordered structures through combined experimental and theoretical methods.

Findings

Non-uniform critical current density affects magnetic field response in 2D arrays.

Remanent magnetization originates from disorder in 3D arrays.

AC susceptibility depends on temperature and magnetic field in complex ways.

Abstract

By employing mutual-inductance technique and using a high-sensitive bridge, we have thoroughly investigated (both experimentally and theoretically) the temperature and magnetic field dependence of complex AC susceptibility of artificially prepared highly ordered (periodic) two-dimensional Josephson junction arrays (2D-JJA) of both shunted and unshunted Nb-based tunnel junctions as well as disordered three-dimensional arrays (3D-JJA). This paper reviews some of our latest results regarding the influence of non-uniform critical current density profile on magnetic field behavior of AC susceptibility in 2D-JJA, and the origin of remanent magnetization in disordered 3D-JJAs.