高自旋BC模型基态相变的研究  

Research of Ground-state Phase Transitions of High-spin BC Model

作　　者：许星光[1] 赵杰[1] 

机构地区：[1]辽宁石油化工大学理学院,抚顺113001

出　　处：《科学技术与工程》2012年第34期9306-9308,9312,共4页Science Technology and Engineering

基　　金：教育部博士点基金(20040145019)资助

摘　　要：采用相关有效场理论,对具有正方点阵结构的S=2横向BC模型,推导出系统的磁矩公式,并利用数值计算方法得到了基态相图。研究发现三种相变线将相图分成三个区域:有序铁磁相O1、有序铁磁相O2及无序顺磁相P,一级有序-有序相变线将铁磁相分成了O1及O2,并使铁磁相O2的区域非常狭窄。investigated. Using the correlated effective-field theory, the spin-2 transverse BC model for the square lattice is The expressions of magnetization are obtained and by numerical calculation the ground-state phase di- agram is given. It is found that there are three areas divided by the three phase transition lines in the phase dia- gram： the order ferromagnetic phaseO1 , the order ferromagnetic phase O2 and the disorder paramagnetic phase P. The ferromagnetic phase is divided by the first order-order phase transition line into O1 and O2 , and the area of the ferromagnetic phase O2 is very narrow.

关 键 词：相关有效场理论 正方点阵 BC模型 相图 基态 

分 类 号：O414.13[理学—理论物理]