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|Critical behavior of a system with orientational and positional degrees of freedom: A Monte Carlo simulation study
|Vives i Santa-Eulàlia, Eduard
Planes Vila, Antoni
|Transformacions de fase (Física estadística)
Mètode de Montecarlo
Phase transformations (Statistical physics)
Monte Carlo method
|The American Physical Society
|The critical behavior of a system constituted by molecules with a preferred symmetry axis is studied by means of a Monte Carlo simulation of a simplified two-dimensional model. The system exhibits two phase transitions, associated with the vanishing of the positional order of the center of mass of the molecules and with the orientational order of the symmetry axis. The evolution of the order parameters and the specific heat is also studied. The transition associated with the positional degrees of freedom is found to change from a second-order to a first-order behavior when the two phase transitions are close enough, due to the coupling with the orientational degrees of freedom. This fact is qualitatively compared with similar results found in pure liquid crystals and liquid-crystal mixtures.
|Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.43.13335
|It is part of:
|Physical Review B, 1991, vol. 43, núm. 16, p. 13335-13341.
|Appears in Collections:
|Articles publicats en revistes (Física Quàntica i Astrofísica)
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