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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Superconductor-insulator transition of Josephson-junction arrays on a honeycomb lattice in a magnetic field

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Autor(es):
Granato, Enzo
Número total de Autores: 1
Tipo de documento: Artigo Científico
Fonte: European Physical Journal B; v. 89, n. 3 MAR 14 2016.
Citações Web of Science: 6
Resumo

We study the superconductor to insulator transition at zero temperature in a Josephson-junction array model on a honeycomb lattice with f flux quantum per plaquette. The path integral representation of the model corresponds to a (2+1)-dimensional classical model, which is used to investigate the critical behavior by extensive Monte Carlo simulations on large system sizes. In contrast to the model on a square lattice, the transition is found to be first order for f = 1/3 and continuous for f = 1/2 but in a different universality class. The correlation-length critical exponent is estimated from finite-size scaling of vortex correlations. The estimated universal conductivity at the transition is approximately four times its value for f = 0. The results are compared with experimental observations on ultrathin superconducting films with a triangular lattice of nanoholes in a transverse magnetic field. (AU)

Processo FAPESP: 14/15372-3 - Dinâmica e defeitos topológicos em meios periódicos
Beneficiário:Enzo Granato
Linha de fomento: Auxílio à Pesquisa - Regular