| Texto completo | |
| Autor(es): |
Granato, Enzo
Número total de Autores: 1
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| Tipo de documento: | Artigo Científico |
| Fonte: | PHYSICAL REVIEW B; v. 94, n. 6, p. 5-pg., 2016-08-01. |
| Resumo | |
We study the superconductor-insulator transition in nanohole ultrathin films in a transverse magnetic field by numerical simulation of a Josephson-junction array model. Geometrical disorder due to the random location of nanoholes in the film corresponds to random flux in the array model. Monte Carlo simulation in the path-integral representation is used to determine the critical behavior and the universal resistivity at the transition as a function of disorder and average number of flux quanta per cell, f(o). The resistivity increases with disorder for noninteger f(o) while it decreases for integer f(o), and reaches a common constant value in a vortex-glass regime above a critical value of the flux disorder D-f(c). The estimate of D-f(c) and the resistivity increase for noninteger f(o) are consistent with recent experiments on ultrathin superconducting films with positional disordered nanoholes. (AU) | |
| Processo FAPESP: | 14/15372-3 - Dinâmica e defeitos topológicos em meios periódicos |
| Beneficiário: | Enzo Granato |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |