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arXiv 0805.0983cond-mat.stat-mechcond-mat.str-el
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具有竞争相互作用的Ising正方晶格的Phase diagram

Phase diagram of the Ising square lattice with competing interactions

A. Kalz, A. Honecker, S. Fuchs, T. Pruschke

摘要:

我们通过蒙特卡罗模拟重新研究了最近邻键上有竞争相互作用$J_1$和次最近邻键上有竞争相互作用$J_2$的二维伊辛模型的相图。我们提出了有限温度相图,并介绍了计算方法,使我们能够计算过渡温度接近$J_2 = 0.5 J_1$的临界点。进一步研究了不同相界的性质,发现对于中等的$J_2 > 0.5 J_1$,相变是弱的一级相变。

英文摘要:

We restudy the phase diagram of the 2D-Ising model with competing interactions $J_1$ on nearest neighbour and $J_2$ on next-nearest neighbour bonds via Monte-Carlo simulations. We present the finite temperature phase diagram and introduce computational methods which allow us to calculate transition temperatures close to the critical point at $J_2 = 0.5 J_1$. Further on we investigate the character of the different phase boundaries and find that the transition is weakly first order for moderate $J_2 > 0.5 J_1$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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