严格求解Cario点阵Ising-XXZ模型的基态相图  

The exact ground state phase diagram of Ising-XXZ model on Cario lattice

作　　者：陈起辉[1] 李鹏[1] 

机构地区：[1]四川大学物理科学与技术学院,成都610064

出　　处：《四川大学学报（自然科学版）》2014年第6期1217-1222,共6页Journal of Sichuan University(Natural Science Edition)

摘　　要：最近,人们发现了具有Cairo点阵结构的材料Bi2Fe4O9,其中具有磁性的Fe+3组成Cairo点阵.本文中,我们给出严格求解一类Ising-XXZ模型基态相图的一般分析步骤,并且将其应用到Cairo点阵Ising-XXZ模型的求解中.从体系的配分函数出发,通过对我们不太关心的自由度进行求迹消去,以得到一个有效的Ising模型.然后,通过对有效模型的能量求极值,建立原体系的基态相图.Recently, Since the real materials with a Cairo lattice structure were found, where the mag- netic Fe^3＋ in Bi2Fe409 arrange into the Cairo lattice. In this paper, we design a general method to deal with a classical Ising-XXZ mode. Then we apply this method to Ising-XXZ model on Cario lattice. Start- ing from partition function, we can get the effective Ising model by integrating the unimportant degree of freedom. Thus, the ground state phase diagram of such system can be obtained simply by minimizing the energy of the system.

关 键 词：阻挫 Ising-XXZ模型 Cario点阵 磁性 

分 类 号：O413[理学—理论物理]