变分累积展开对不同格点结构的磁性薄膜的热动力学性质的研究  

Thermodynamical Properties of Heisenberg Films with Cubic Lattices in Variational-Cumulant Expansion

作　　者：张君霞[1] 陈洪[1] 

机构地区：[1]西南师范大学物理学院,重庆400715

出　　处：《西南师范大学学报（自然科学版）》2005年第3期457-460,共4页Journal of Southwest China Normal University(Natural Science Edition)

基　　金：重庆市科委应用基础研究项目(20038111).

摘　　要：采用变分累积展开方法,研究了面心立方(fcc)、体心立方(bcc)格点上Heisenberg磁性薄膜的热动力学性质,计算其临界温度、内能和热容到了三级累积展开.作为一个特例,对自旋1/2铁磁性薄膜,给出了这些物理量随温度和薄膜原子层数的变化关系,并与简立方(sc)情形下的相应结果作了比较.Thermodynamic properties of Heisenberg films with cubic lattices are investigated in variational-cumulant expansion. The critical temperature, internal energy and specific heat are calculated to the third order. As an example, the variations of these physics quantities with the temperature and the number of atomic layers are given for spin-1/2 thin films of body-centered-cubic and face-centered-cubic lattices, and are compared with these in simple cubic lattices.

关 键 词：磁性薄膜 临界温度 内能 热容 

分 类 号：O484.43[理学—固体物理]