| Texto completo | |
| Autor(es): |
Ramos, J. A. P.
;
Granato, E.
;
Achim, C. V.
;
Ying, S. C.
;
Elder, K. R.
;
Ala-Nissila, T.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Physical Review E; v. 78, n. 3, p. 7-pg., 2008-09-01. |
| Resumo | |
We study the influence of thermal fluctuations in the phase diagram of a recently introduced two-dimensional phase field crystal model with an external pinning potential. The model provides a continuum description of pinned lattice systems allowing for both elastic deformations and topological defects. We introduce a nonconserved version of the model and determine the ground-state phase diagram as a function of lattice mismatch and strength of the pinning potential. Monte Carlo simulations are used to determine the phase diagram as a function of temperature near commensurate phases. The results show a rich phase diagram with commensurate, incommensurate, and liquidlike phases with a topology strongly dependent on the type of ordered structure. A finite-size scaling analysis of the melting transition for the c (2 x 2) commensurate phase shows that the thermal correlation length exponent nu and specific heat behavior are consistent with the Ising universality class as expected from analytical arguments. (AU) | |
| Processo FAPESP: | 07/08492-9 - Dinâmica, defeitos topológicos e transições de fase em meios ordenados |
| Beneficiário: | Enzo Granato |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |