Phase behavior of unsymmetrical dimers on a square lattice

Monte Carlo simulations in the grand canonical ensemble have been carried out to study phase transitions in monolayers formed by heterogeneous dimers, composed of segments A and B, on a square lattice. The unsymmetrical segment–segment interactions are assumed ( u AA ≠ u BB). The systems with u AB =...

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Bibliographic Details
Published in:Surface science 2006-02, Vol.600 (4), p.890-896
Main Authors: RZYSKO, W, BOROWKO, M
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Physics
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Summary:Monte Carlo simulations in the grand canonical ensemble have been carried out to study phase transitions in monolayers formed by heterogeneous dimers, composed of segments A and B, on a square lattice. The unsymmetrical segment–segment interactions are assumed ( u AA ≠ u BB). The systems with u AB = u BB = −1 and different AA-interactions studied in our previous work [W. Rżysko, M. Borówko, Surf. Sci. 520 (2002) 151] are reconsidered. The structural phase transitions at high temperatures are investigated. It is shown that topology of a phase diagram depends on the energy u AA. For repulsive AA-interactions a triple point is found and the system belongs to the universality class of a tricritical point. When u AA < 0 the critical line of the order–disorder transition terminates at a critical end point and the system belongs to the universality class of the 2D Ising model.
ISSN:0039-6028
1879-2758
DOI:10.1016/j.susc.2005.12.014