IEO法研究三维各向异性XYZ-Heisenberg铁磁系统  

IEO Method in the Three-dimensional Anisotropic XYZ-Heisenberg Ferromagnetic System

作　　者：成泰民[1] 贾维烨[1] 葛崇员[1] 钟国宁[1] 

机构地区：[1]沈阳化工大学数理系,辽宁沈阳110142

出　　处：《沈阳化工大学学报》2012年第4期370-372,384,共4页Journal of Shenyang University of Chemical Technology

基　　金：国家自然科学基金项目(10647138);辽宁省教育厅科学研究项目(20060667)

摘　　要：利用不变本征算符法、D-M变换和点阵傅立叶变换、宇称变换等幺正变换对三维各向异性XYZ-Heisenberg铁磁系统的Hamiltonian进行对角化.得到系统的自旋波谱(磁振子谱)及基态能量.并且推导出系统的配分函数、自由能、内能、熵、比热、磁化强度、磁化率等的解析表达式.同时对其特殊情况下的结论进行讨论.In this paper,the Hamiltonian of three-dimensional anisotropic XYZ-Heisenberg ferromagnetic system was diagonalized with IEO method,D-M transformation and unitary transformation such as the Fourier transformation of lattice,the parity transformation. The spin wave spectrum and ground state energy of the system were obtained. And the analytical expression of partition function,free energy,internal energy,entropy,specific heat,magnetization and magnetic susceptibility in the system were derived. And conclusion in special cases was also discussed.

关 键 词：XYZ-Heisenberg铁磁系统 自旋波谱 不变本征算符法 热学性质 磁性 

分 类 号：O482.5[理学—固体物理]