二维稀磁Ising铁磁体的磁化行为  

The Magnetization Behavior of Two-Dimensional Diluted Ising Ferromagnet

作　　者：魏国柱[1] 顾永伟[1] 辛子华[1] 张起[1] 

机构地区：[1]东北大学理学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2005年第6期606-608,共3页Journal of Northeastern University(Natural Science)

基　　金：教育部高等学校骨干教师资助计划项目(20020201)

摘　　要：对处于外磁场中,自旋为1/2的具有二维正方晶格结构的稀磁Ising铁磁体模型,采用相关有效场理论,推导出了不同浓度下系统的磁矩、磁化率的理论公式·对磁化过程中系统主要物理量随温度、浓度等因素变化的情况进行了探讨·对给定的浓度和温度,磁矩随外场强度增大而变大;而对给定的浓度和磁场,磁矩随温度升高而减小·得到了基态时系统的序参量随浓度的变化曲线及该结构在不同浓度下的相图·The magnetization behavior of pure spin(1/2) diluted Ising model with square lattice in the outer magnetic field was investigated. Using the effective-field theory with correlation, the magnetization and susceptibility formulation of the model were derived theoretically. How the main physical quantities change with temperature and doping concentration in the process of magnetization were discussed. Under the conditions that the doping concentration and temperature remain unchanged, the magnetization increases with the outer magnetic field intensity; if the doping concentration and magnetic field are of given values, the magnetization will decrease with the temperature becoming higher. The relationship between order parameters and doping concentration of the system was obtained in the ground state, as well as the relevant phase diagram.

关 键 词：相关有效场理论 稀磁lsing模型 磁化行为 正方晶格 相图 

分 类 号：O482.523[理学—固体物理]