Magnetic properties of artificially prepared ordered two-dimensional shunted and unshunted Nb-AlO_x-Nb Josephson Junction Arrays

TL;DR

This paper investigates the magnetic properties of ordered 2D Nb-AlO_x-Nb Josephson junction arrays, revealing effects of current density profiles, dynamic reentrance phenomena, and geometric quantization in their magnetic responses.

Contribution

It provides new experimental data and theoretical insights into the magnetic behavior of both shunted and unshunted Josephson junction arrays, highlighting novel effects and phenomena.

Findings

Influence of non-uniform critical current density on AC susceptibility

Identification of the origin of dynamic reentrance phenomenon

Observation of geometric quantization effects in temperature-dependent magnetic response

Abstract

In this Chapter, we present our latest experimental results (along with their theoretical interpretation) related to some unusual magnetic properties of artificially prepared ordered two-dimensional Josephson junction arrays (of both shunted and unshunted Nb-AlO_x-Nb tunnel junctions). Namely, we address the following topics: (i) influence of non-uniform critical current density profile on magnetic field behavior of AC susceptibility, (ii) origin of the so-called dynamic reentrance phenomenon, and (iii) manifestation of novel geometric quantization effects in temperature behavior of AC magnetic response.