Magnetic Field Induced Charging Effects in Josephson Junction Arrays

TL;DR

This paper investigates how magnetic fields influence electric polarization and capacitance in disordered Josephson junction arrays, revealing threshold-dependent maximum charge and sign change, with potential experimental observations.

Contribution

It introduces a 3D model showing magnetic field-induced polarization effects and capacitance sign reversal in disordered Josephson junction arrays.

Findings

Maximum effective junction charge at threshold field

Capacitance sign change near critical field

Potential for experimental observation in superconducting arrays

Abstract

A magnetic field induced electric polarization and the corresponding change of an effective junction capacitance are considered within a 3D model of disordered Josephson junction arrays. At some threshold field (near the Josephson network critical field), the effective junction charge and the related capacitance are shown to reach a maximum and to change a sign, respectively. A possibility to observe the predicted effects in artificially prepared arrays of superconducting grains is discussed.