双模随机晶场对混合spin-1/2和spin-1纳米管系统磁化强度的影响  

Effects of bimodal random crystal field on magnetic properties of mixed spin-1/2 and spin-1 on nanotube

作　　者：李晓杰 信苗苗 蔡秀国 刘恩超 LI Xiao-Jie;XIN Miao-Miao;CAI Xiu-Guo;LIU En-Chao(Qilu Institute of Technology,Jinan 250200,China)

机构地区：[1]齐鲁理工学院,济南250200

出　　处：《四川大学学报（自然科学版）》2020年第5期987-992,共6页Journal of Sichuan University(Natural Science Edition)

基　　金：齐鲁理工学院科技计划项目(QL19K060)。

摘　　要：本文利用有效场论研究了原子掺杂对纳米管晶格点磁化强度的影响.结果表明,掺杂程度、晶场取值概率、最近邻交换相互作用与晶场强度相互竞争,使系统具有丰富的磁化特性.当负晶场作用于系统时,系统发生一级相变.负晶场越强,对系统磁化强度的阻碍作用越明显.当晶场参数和掺杂程度不同时,系统磁化强度随温度的变化表现出奇异性.The effect of atomic doping on the magnetization of nanotube lattice points was studied by using the effective field theory.The results show that the doping degree,the probability of crystal field values,the nearest neighbor exchange interaction and the crystal field strength compete with each other,which make the system show rich magnetic characteristics.When the negative crystal field acts on the system,the first-order phase transition occurs.The stronger the negative crystal field,the more obvious the hindrance to the magnetization of the system.When the parameters and doping modes of crystal field are different,the evolution of the magnetization intensity on temperature exhibits unusual behaviors.

关 键 词：随机晶场 磁化强度 BLUME-CAPEL模型 纳米管 有效场理论 

分 类 号：TB383[一般工业技术—材料科学与工程]