高自旋横向Ising模型的基态磁性  

The Ground-state Magnetic Properties of High-spin Transverse Ising 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31期8133-8136,共4页Science Technology and Engineering

基　　金：教育部博士点基金项目(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Ising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的磁化曲线。研究发现在基态下,系统随晶场或横场的变化产生了一级有序—有序相变、一级有序—无序相变及二级相变,二级相变普遍存在,一级相变只存在于狭窄的晶场和横场范围内。Using the correlated effective-field theory, the spin-2 transverse Ising model with the crystal field for the square lattice has been investigated. The expressions of magnetization were obtained and by numerical calcula- tion the ground-state magnetization curves were given. It was found that there were the first order-order phase tran- sitions, the first order-disorder phase transitions and the second order phase transitions in the ground state. The second order transitions are widespread, and the first order transitions are occurred in the very narrow range of crys- tal field and transverse field.

关 键 词：相关有效场理论 正方点阵 ISING模型 磁化曲线 基态 

分 类 号：O414.13[理学—理论物理]