一维亚铁磁混合自旋链的磁特性的Monte Carlo模拟  

Magnetic Properties of a Mixed One-dimensional Ferrimagnetic Spin Chain: Monte Carlo Simulation

作　　者：沈双娟[1] 蒋丽钦[1] 杨艳敏[1] 冯倩[1] 黄志高[1] 

机构地区：[1]福建师范大学物理与光电信息科技学院,福建福州350007

出　　处：《计算物理》2007年第2期222-226,共5页Chinese Journal of Computational Physics

基　　金：973项目(G2005CB623605);福建省自然科学基金重点项目(E0320002)资助项目

摘　　要：基于一维自旋链模型,采用Monte Carlo方法对具有反铁磁相互作用的自旋-1和自旋-3/2交替混合的亚铁磁系统进行模拟计算,研究单离子各向异性对系统磁特性的影响.模拟结果发现:基态时系统的磁化强度在外加磁场作用下呈现出阶梯状,并获得了自旋-1和自旋-3/2交替混合的亚铁磁系统相图.最后,通过对系统能量和自旋组态的研究,解释了该系统中出现的阶梯效应和相图.Monte Carlo simulation is performed to study the magnetic properties of mixed spin-1 and spin-3/2 ferrimagnetic systems in a onedimensional spin chain with single-ion anisotropy. It is found that magnetization plateaus in external fields at ground state exist. A phase diagram of mixed spin-1 and spin-3/2 ferrimagnetic systems is obtained. The magnetic plateaus and the phase diagrams of the system are explained well with analysis of energy and spin configuration.

关 键 词：磁性 混合自旋系统 MONTE Carlo 自旋链 

分 类 号：O482.5[理学—固体物理]