稀疏晶场作用的键无规BC模型的相变特性

Phase transitions properties of anisotropy dilution and random bond BC model

运用切断近似的方法,在有效场框架下,对稀疏晶场作用的键无规Blume-Capel(BC)模型的相变进行了研究.具体分析了三种键无规分布的BC模型.分别探讨了系统三临界点(TCP)随稀疏晶场和键无规这两种无序因子的变化关系及相变曲线呈现的一些新特征,对不同键无规分布的BC模型的相图进行了比较,并给出相应的相图.

By using a cutting approximation, the phase diagrams of three-dimensional anisotropy dilution and random bond Blume-Capel Model （BCM） have been studied within the framework of an effective field theory. The effect of three kinds of the random bond and anisotropy dilution on the phase diagrams is discussed. The trajectory of the tricriti：al point （TCP） in the phase space as a function of two different disorder parameters is presented. Also, the phase transition lines display some new characters. At the same time, we give the more detailed descriptions of phase diagrams.