Configurational entropy of systems with non-additive lateral interactions

PINTO O. A; RAMÍREZ-PASTOR A.J.; NIETO F. D.

PHYSICA A - STATISTICAL AND THEORETICAL PHYSICS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2012 vol. 931 p. 6390 - 6398

0378-4371

The configurational entropy per site of a lattice_gas model with non-additive interactionsbetween adsorbed particles for square, triangular and honeycomb lattices is discussed in thepresent study. The model used here assumes that the energy which links a certain atom withany of its nearest-neighbors strongly depends on the state of occupancy in the firstcoordination sphere of that adatom. By means of Monte Carlo simulations in the canonicalensemble by following the algorithm of parallel tempering and thermodynamic integrationmethod the configurational entropy per site has been calculated. By analyzing the behaviorof the configurational entropy per site, the different low-temperature-ordered phases aredescribed. The dependency of the critical temperature of the system as a function ofcharacteristic parameters of the model is established