arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.10373cond-mat.stat-mechcond-mat.mtrl-scicond-mat.soft
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弹性伊辛模型中平均场行为的起源

The Origin of Mean-Field Behavior in an Elastic Ising Model

Layne B. Frechette, Christoph Dellago, Phillip L. Geissler

摘要:

根据经验,自旋交叉化合物的简单弹性模型表现出经典的临界行为。我们演示了如何长距离的相互作用,负责这种行为自然出现在整合了这样一个模型的机械波动。平均场论应用到所得到的有效哈密顿量定量地解释了在计算机模拟中观察到的热力学和动力学,包括随着系统尺寸广泛增长的磁化反转的障碍。对于打破平移对称性的纳米晶体,平均场论的直接扩展也能得到类似的精确结果。

英文摘要:

Simple elastic models of spin-crossover compounds are known empirically to exhibit classical critical behavior. We demonstrate how the long-ranged interactions responsible for this behavior arise naturally upon integrating out mechanical fluctuations of such a model. A mean field theory applied to the resulting effective Hamiltonian quantitatively accounts for both thermodynamics and kinetics observed in computer simulations, including a barrier to magnetization reversal that grows extensively with system size. For nanocrystals, which break translational symmetry, a straightforward extension of mean field theory yields similarly accurate results.

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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