Eur. Phys. J. B 44, 33-39 (2005)
https://doi.org/10.1140/epjb/e2005-00096-4

On the origin of reentrance in 2D Josephson junction arrays

¹ Departamento de Física e Engenharia Física, Grupo de Materiais e Dispositivos, Centro Multidisciplinar para o Desenvolvimento de Materiais Cerâmicos, Universidade Federal de São Carlos, São Carlos, SP, 13565-905, Brazil
² Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 141980, Moscow Region, Russia

Corresponding author: ^a ssa@thsun1.jinr.ru

Received: 22 October 2004
Revised: 15 December 2004
Published online: 16 April 2005

Abstract

A comparative study of the magnetic properties of shunted and unshunted two-dimensional Josephson junction arrays (2D-JJA) is presented. Using a single-plaquette approximation of the 2D-JJA model, we were able to successfully fit all our experimental data (for the temperature, AC and DC field dependencies of susceptibility) and demonstrate that the dynamic reentrance of AC susceptibility is directly linked to the value of the Stewart-McCumber parameter . Based on extensive numerical simulations, a phase diagram is plotted which demarcates the border between the reentrant and non-reentrant behavior in the arrays.