| Texto completo | |
| Autor(es): |
Granato, Enzo
Número total de Autores: 1
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| 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 |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |