Monte Carlo Study of Phase Transitions in the Bond-Diluted 3D 4-State Potts Model

Details Monte Carlo Study of Phase Transitions in the Bond-Diluted 3D 4-State Potts Model Monte Carlo Study of Phase Transitions in the Bond-Diluted 3D 4-State Potts Model

2005-01-06

arxiv.org/abs/cond-mat/0501115v2

Nuclear Physics B 719/3 (2005) 275

Physics

Condensed Matter

Statistical Mechanics

Revised version, 40 pages, 30 figures

Scientific paper

10.1016/j.nuclphysb.2005.05.003

Large-scale Monte Carlo simulations of the bond-diluted three-dimensional 4-state Potts model are performed. The phase diagram and the physical properties at the phase transitions are studied using finite-size scaling techniques. Evidences are given for the existence of a tricritical point dividing the phase diagram into a regime where the transitions remain of first order and a second regime where the transitions are softened to continuous ones by the influence of disorder. In the former regime, the nature of the transition is essentially clarified through an analysis of the energy probability distribution. In the latter regime critical exponents are estimated. Rare and typical events are identified and their role is qualitatively discussed in both regimes.

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