| Full text | |
| Author(s): |
Granato, Enzo
Total Authors: 1
|
| Document type: | Journal article |
| Source: | Physical Review B; v. 94, n. 6 AUG 1 2016. |
| Web of Science Citations: | 3 |
| Abstract | |
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) | |
| FAPESP's process: | 14/15372-3 - Dynamics and topological defects in periodic media |
| Grantee: | Enzo Granato |
| Support type: | Regular Research Grants |