@Article{Granato:2018:BoFlEf,
author = "Granato, Enzo",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
title = "Bond and flux-disorder effects on the superconductor-insulator
transition of a honeycomb array of Josephson junctions",
journal = "Physica B: Condensed Matter",
year = "2018",
volume = "536",
pages = "442--446",
month = "may",
keywords = "Superconductor-insulator transition, Josephson-junction arrays,
Granular superconductors.",
abstract = "We study the effects of disorder on the zero-temperature quantum
phase transition of a honeycomb array of Josephson junctions in a
magnetic field with an average of flux quantum per plaquette. Bond
disorder due to spatial variations in the Josephson couplings and
magnetic flux disorder due to variations in the plaquette areas
are considered. The model can describe the
superconductor-insulator transition in ultra-thin films with a
triangular pattern of nanoholes. Path integral Monte Carlo
simulations of the equivalent (2 + 1)-dimensional classical model
are used to study the critical behavior and estimate the universal
resistivity at the transition. The results show that bond disorder
leads to a rounding of the first-order phase transition for to a
continuous transition. For integer , the decrease of the critical
coupling parameter with flux disorder is significantly different
from that of the same model defined on a square lattice. The
results are compared with recent experimental observations on
nanohole thin films with geometrical disorder and external
magnetic field.",
doi = "10.1016/j.physb.2017.09.086",
url = "http://dx.doi.org/10.1016/j.physb.2017.09.086",
issn = "0921-4526",
language = "en",
targetfile = "granato_bond.pdf",
urlaccessdate = "27 abr. 2024"
}