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Phase Transitions in the Two-Dimensional Ferro- and Antiferromagnetic Potts Models on a Triangular Lattice

机译:三角形晶格上二维铁磁和反铁磁Potts模型中的相变

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摘要

The phase transitions in the two-dimensional ferro- and antiferromagnetic Potts models with q = 3 states of spin on a triangular lattice are studied using cluster algorithms and the classical Monte Carlo method. Systems with linear sizes L = 20–120 are considered. The method of fourth-order Binder cumulants and his-togram analysis are used to discover that a second-order phase transition occurs in the ferromagnetic Potts model and a first-order phase transition takes place in the antiferromagnetic Potts model. The static critical indices of heat capacity (α), magnetic susceptibility (γ), magnetization (β), and correlation radius index (ν) are calculated for the ferromagnetic Potts model using the finite-size scaling theory.
机译:使用聚类算法和经典的蒙特卡洛方法研究了q = 3的自旋态在三角形晶格上的二维铁磁和反铁磁Potts模型中的相变。考虑线性尺寸为L = 20–120的系统。利用四阶Binder累积量和直方图分析的方法,发现在铁磁Potts模型中发生了二阶相变,而在反铁磁Potts模型中发生了一阶相变。使用有限尺寸缩放理论为铁磁Potts模型计算了热容量(α),磁化率(γ),磁化强度(β)和相关半径指数(ν)的静态临界指标。

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