@Article{Granato:2021:MaFrCh,
               author = "Granato, Enzo",
          affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)}",
                title = "Magnetic-field frustration and chiral-glass to insulator 
                         transition in superconducting arrays with random pi junctions",
              journal = "European Physical Journal B",
                 year = "2021",
               volume = "94",
               number = "7",
                pages = "e143",
                month = "July",
             abstract = "We study the effects of random pi Josephson junctions and applied 
                         magnetic field on the quantum phase transitions of superconducting 
                         arrays, described by a two-dimensional phase-glass model. The 
                         zero-temperature phase diagram and critical behavior are obtained 
                         from path-integral Monte Carlo simulations. A superconducting 
                         chiral-glass phase occurs for sufficiently large disorder 
                         resulting from frustration effects of the pi junctions. Unlike the 
                         superconductor-insulator transition for weak disorder, the 
                         chiral-glass to insulator transition is insensitive to additional 
                         frustration introduced by an external magnetic field corresponding 
                         to half flux quantum per plaquette. The results are consistent 
                         with recent measurements on superconducting thin films with a 
                         periodic pattern of nanoholes in an applied magnetic field and 
                         doped with magnetic impurities. The magnetic-field frustration 
                         effects for the activation energy at low doping and its 
                         disappearance at higher doping, observed experimentally, is 
                         indicative of a transition to the chiral-glass regime.",
                  doi = "10.1140/epjb/s10051-021-00162-3",
                  url = "http://dx.doi.org/10.1140/epjb/s10051-021-00162-3",
                 issn = "1434-6028",
             language = "en",
           targetfile = "granato_magnetic.pdf",
        urlaccessdate = "29 jun. 2024"
}