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@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",
                 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 nov. 2020"
}


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