具有长程相互作用XXZ铁磁体链的热力学性质  

Thermodynamic properties of the XXZ ferromagnetic chain with long-range interactions

作　　者：李嘉亮[1] 类淑国[2] 

机构地区：[1]常熟理工学院物理与电子科学系 [2]南京工业大学应用物理系,江苏南京210009

出　　处：《安徽大学学报（自然科学版）》2008年第1期53-57,共5页Journal of Anhui University(Natural Science Edition)

基　　金：江苏省新型功能材料重点建设实验室开放基金资助项目(06KFJJ004)

摘　　要：采用平均场Jordan-Wigner变换分析,研究外场中且具有Z方向均匀长程相互作用自旋-1/2 XXZ铁磁体链的热力学性质,得到了系统的亥姆赫兹自由能、内能、比热、磁化强度、磁化率等热力学量的解析表达式及其数值解,并讨论了有限温度时系统的相变.在退化条件下的结果与其他文献的结果相符.The one -dimensional spin-1/2 Heisenberg XXZ ferromagnetic chain with uniform longrange interactions among the z components of the spins in the transverse field was studied by using the meanfield Jordan - Wigner transformation. The analytic expressions and the numerical results of the thermodynamic quantities, including the Helmholtz free energy, internal energy, specific heat, magnetization and isothermal susceptibility, were obtained. We also discussed the phase transitions of the system at a finite temperature. Our results agreed with that from other literatures in the degenerate condition.

关 键 词：HEISENBERG XXZ铁磁体链 平均场Jordan-Wigner变换 长程相互作用 

分 类 号：O482.51[理学—固体物理]