Manifestation of geometric resonance in current dependence of AC susceptibility for unshunted array of Nb-AlOx-Nb Josephson junctions

TL;DR

This paper reports the observation of a resonance-like feature in the AC susceptibility of a Nb-AlOx-Nb Josephson junction array, attributed to geometric inductive effects, supported by a single-plaquette model fitting.

Contribution

It demonstrates the manifestation of geometric resonance in Josephson junction arrays and models it using a single-plaquette approximation.

Findings

Resonance-like structure observed in AC susceptibility.

Resonance related to geometric (inductive) properties.

Single-plaquette model successfully fits the data.

Abstract

A pronounced resonance-like structure has been observed in the current dependence of AC susceptibility for two-dimensional array of unshunted Nb-AlOx-Nb Josephson junctions. Using a single-plaquette approximation, we were able to successfully fit our data assuming that resonance structure is related to the geometric (inductive) properties of the array.