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arXiv 1307.2011cond-mat.stat-mech
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三维类Ising系统在最简和高阶非高斯近似下的序参量

Order parameter of a three-dimensional Ising-like system in the simplest and higher non-Gaussian approximations

I. V. Pylyuk

摘要:

以序参量为例,说明了集体变量法在研究系统非普适特征在临界区的行为中的应用。在考虑汇流修正的情况下,分别用四次和六次非高斯涨落分布(ρ^4和ρ^6模型)近似,得到了三维单轴磁体的序参量(平均自旋矩)的显式表达式。指出了在两个连续非高斯近似的基础上计算序参量的过程中出现的一些显著特点。研究了类伊辛体系的平均自旋矩与温度和微观参数的关系。

英文摘要:

The application of the collective variables method to the study of the behaviour of nonuniversal characteristics of the system in the critical region is illustrated by an example of the order parameter. Explicit expressions for the order parameter (the average spin moment) of a three-dimensional uniaxial magnet are obtained in approximations of quartic and sextic non-Gaussian fluctuation distributions (the ρ^4 and ρ^6 models, respectively), taking into account confluent corrections. Some distinctive features appearing in the process of calculating the order parameter on the basis of two successive non-Gaussian approximations are indicated. The dependence of the average spin moment of an Ising-like system on the temperature and microscopic parameters is studied.

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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