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arXiv 0909.4000cond-mat.stat-mechphysics.comp-ph
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Phase diagram和具有竞争近邻和次近邻相互作用的正方格子伊辛模型的临界行为

Phase diagram and critical behavior of the square-lattice Ising model with competing nearest- and next-nearest-neighbor interactions

Junqi Yin, D. P. Landau

摘要:

采用并行回火算法和GPU加速技术,在均匀磁场作用下,对具有相同强度的反铁磁(排斥)最近邻(NN)和次最近邻(NNN)相互作用的正方晶格上的伊辛模型进行了大规模蒙特卡罗模拟.从(2x1)和行移位(2x2)有序相到顺磁相的转变都是连续的。从我们的数据分析,(2 × 1)的临界线和双临界点,分离的两个有序相在T=0的再入行为被证实。根据我们沿相边界得到的临界指数,铃木的弱普适性似乎成立。

英文摘要:

Using the parallel tempering algorithm and GPU accelerated techniques, we have performed large-scale Monte Carlo simulations of the Ising model on a square lattice with antiferromagnetic (repulsive) nearest-neighbor(NN) and next-nearest-neighbor(NNN) interactions of the same strength and subject to a uniform magnetic field. Both transitions from the (2x1) and row-shifted (2x2) ordered phases to the paramagnetic phase are continuous. From our data analysis, reentrance behavior of the (2x1) critical line and a bicritical point which separates the two ordered phases at T=0 are confirmed. Based on the critical exponents we obtained along the phase boundary, Suzuki's weak universality seems to hold.

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