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
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.
PACS: 74.25.Ha – Magnetic properties / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects / 74.80.-g – Spatially inhomogeneous structures
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005