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arXiv 0912.4586cond-mat.stat-mechcond-mat.dis-nn
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揭开2D随机键Blume-Capel模型的秘密

Uncovering the secrets of the 2d random-bond Blume-Capel model

A. Malakis, A. Nihat Berker, I. A. Hadjiagapiou, N. G. Fytas, T. Papakonstantinou

摘要:

讨论了键随机性对正方晶格铁磁Blume-Capel(BC)模型基态结构、相图和临界行为的影响。在强无序和大晶场值下的基态的计算是通过将系统映射到一个网络上,并用最大流方法寻找最小割来进行的。在有限的温度下,系统的研究是由一个有效的两阶段Wang-Landau(WL)方法的几个值的晶体场,包括第一和第二阶相变制度的纯模型。我们试图解释铁磁有序的增强,我们讨论的随机键模型的临界行为。我们的研究结果提供了证据的一个强烈违反的普遍性沿二级相变线的随机键版本。

英文摘要:

The effects of bond randomness on the ground-state structure, phase diagram and critical behavior of the square lattice ferromagnetic Blume-Capel (BC) model are discussed. The calculation of ground states at strong disorder and large values of the crystal field is carried out by mapping the system onto a network and we search for a minimum cut by a maximum flow method. In finite temperatures the system is studied by an efficient two-stage Wang-Landau (WL) method for several values of the crystal field, including both the first- and second-order phase transition regimes of the pure model. We attempt to explain the enhancement of ferromagnetic order and we discuss the critical behavior of the random-bond model. Our results provide evidence for a strong violation of universality along the second-order phase transition line of the random-bond version.

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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