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Acta Physica Polonica A

Arbitrarily Weak First Order Phase Transitions in the 3D Standard Ashkin-Teller Model by MC Computer Experiments

Dorota Jeziorek-Knioła, Grzegorz Musiał, Zbigniew Wojtkowiak

Published Feb 1, 2015• 6 citations
Publisher

Abstract

The rst order phase transition line in the vicinity of the tricritical Ising point region is studied in the 3D standard AshkinTeller model on a cubic lattice.The large-scale Monte Carlo computer experiments using the Binder-and Challa-like cumulants, the latter modied by Musial, are proposed and performed.Specic behavior of the ChallaMusial cumulants for weak rst order phase transitions is discovered and its interpretation is proposed.The paper proves the arbitrarily weak rst order character of phase transitions when approaching to the Ising point.

DOI
10.12693/aphyspola.127.327

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The rst order phase transition line in the vicinity of the tricritical Ising point region is studied in the 3D standard AshkinTeller model on a cubic lattice.The large-scale Monte Carlo computer experiments using the Binder-and Challa-like cumulants, the latter modied by Musial, are proposed and performed.Specic behavior of the ChallaMusial cumulants for weak rst order phase transitions is discovered and its interpretation is proposed.The paper proves the arbitrarily weak rst order character of phase transitions when approaching to the Ising point.
The phase transition line near the Ising point region is studied for the 3D standard AshkinTeller model on a cubic lattice.This model with a multicomponent order parameter is one of the important reference points in statistical physics since it shows an interesting and complicated phase diagram.The main motivation for our study was nonuniversal behavior suggested for this line.The large-scale Monte Carlo simulations using the Binder and Challa like cumulants are performed.Accurate analysis to exclude the latent heat inherence is applied.Specic behavior of the Challa like cumulants is discovered and its interpretation is proposed.The paper is closed with preliminary conclusions concerning the continuous but non-Ising character of these phase transitions in the lower part of the mixed phase region and the possiblity of the rst order on the line connecting it to the Ising point.
Our Monte Carlo (MC) method has been extended to determine the type of ordering, the character of phase transitions, and positions of the tricritical points in the three-dimensional Ashkin-Teller spin-lattice model on a cubic lattice, which is an example of a system with multicomponent order parameter. The precise and detailed analyses of the system's behavior at the ends of the lines of Ising-like phase transitions are performed and the corrected phase diagram in these regions is presented and discussed. The localizations of the tricritical points are also given. The specific behavior of the Binder cumulant when crossing a bifurcation point has been discovered and interpreted. Some general conclusions on methods of investigation of the critical behavior of a system with a multicomponent order parameter are closing the paper.
The results of the large-scale Monte Carlo simulations of the continuous phase transitions in the three-dimensional Ashkin-Teller model on a cubic lattice are presented in the two-parameter space. The invariance of the ratio of the square of the second moment of the order parameter to its fourth moment in the critical region and the Metropolis algorithm are exploited. Using the universality hypothesis and the finite-size-scaling analysis, the accurate positions of the continuous phase-transition lines are calculated and their Ising character is confirmed. Approximate locations of the tricritical points are also estimated.
Abstract Large‐scale Monte Carlo simulations, based on the invariance of the Binder cumulant Q, for continuous phase transitions in the three‐dimensional Ashkin–Teller spin‐lattice model on a cubic lattice, have been performed. Using the universality hypotesis and the finite‐size‐scaling analysis, the Ising character of phase transitions from the antiferro‐ to paramagnetic phase, where the cumulant Q behavior is different than in the Ising model, is demonstrated. Some preliminary results demonstrating the existance of the tricritical points are also presented.
A Monte Carlo (MC) computer experiment for the analysis of first-order temperature-driven phase transitions in a system with one or many independently behaving order parameters is presented using the example of the three-dimensional (3D) Ashkin-Teller model, one of the important reference systems in statistical physics showing a rich and complex phase diagram. The properties of a number of quantities, such as magnetization, three types of cumulants, the internal energy, and its histogram, are exploited. The Lee and Kosterlitz concept proposed for strong first-order phase transitions in systems with one independent order parameter is significantly expanded to obtain results with comparable error bars in reasonable computation times at an arbitrary amount of latent heat. The proposed computer MC experiment uses parallel processing and both the Metropolis and recently formulated cluster algorithms. Arbitrarily weak to strong first-order phase transitions in the phase diagram region with ferromagnetic interactions are investigated and the latent heat associated with individual degrees of freedom is carefully computed. In the discussion of results, the behavior of our 3D system between that of the mean-field and that of the 2D one is bracketed and the role of the Potts point is clarified.
Monte Carlo simulations in the three-dimensional (3D) Ashkin-Teller model on a cubic lattice are performed in the regions of the two-parameter space diagram where Ising-type phase transitions are expected. The scaling behavior of the Binder cumulant Q and the magnetic susceptibility in the critical region are exploited. In simulations the periodic boundary conditions and the Metropolis algorithm are used. Starting from Ising critical exponents and applying the finite-size-scaling analysis of the cumulant Q with nonlinear corrections, the accurate positions of the critical couplings on the continuous phase transition lines are calculated. For these couplings the critical exponent y(h) is calculated analyzing the magnetic susceptibility in the framework of the finite-size scaling with corrections. The values of y(h) agree with the 3D Ising model value along two lines determined by the order parameter [ssigma] .