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arXiv 0809.2503cond-mat.stat-mechcond-mat.str-el
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具有竞争作用的Ising正方晶格的Monte Carlo研究

Monte Carlo studies of the Ising square lattice with competing interactions

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

摘要:

我们用改进的Monte-Carlo算法研究了最近邻键上有竞争相互作用$J_1$,次近邻键上有竞争相互作用$J_2$的反铁磁二维伊辛模型.有限温度相图除以在$J_2 = J_1/2$的临界点,在该临界点处基态是高度简并的。为了分析相界,我们观察不同比例的$J_2/J_1$的比热和能量分布。我们发现小分子$J_2 > J_1/2$有一级相变,并且在临界点处相变温度被抑制到$T_C=0$。

英文摘要:

We use improved Monte-Carlo algorithms to study the antiferromagnetic 2D-Ising model with competing interactions $J_1$ on nearest neighbour and $J_2$ on next-nearest neighbour bonds. The finite-temperature phase diagram is divided by a critical point at $J_2 = J_1/2$ where the groundstate is highly degenerate. To analyse the phase boundaries we look at the specific heat and the energy distribution for various ratios of $J_2/J_1$. We find a first order transition for small $J_2 > J_1/2$ and the transition temperature suppressed to $T_C=0$ at the critical point.

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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