稀释晶场对spin-1和spin-1/2混合自旋纳米管中 Blume-Capel模型磁化强度的研究  

Study on magnetization of Blume-Capel model in spin-1 and spin-1/2 hybrid spin nanotubes by diluting the crystal field

作　　者：李晓杰 王渺渺 唐顺磊 董明慧 LI Xiao-Jie;WANG Miao-Miao;TANG Shun-Lei;DONG Ming-Hui(Qilu Institute of Technology,Jinan,250200)

机构地区：[1]齐鲁理工学院

出　　处：《原子与分子物理学报》2019年第5期781-788,共8页Journal of Atomic and Molecular Physics

基　　金：齐鲁理工学院校级课题(JG201858)

摘　　要：利用有效场理论研究了纳米管上稀释晶场中混合自旋Blume-Capel模型格点的磁化强度,得到了系统格点的磁化强度与稀释晶场取值概率、外磁场和晶场的关系.结果表明:取值概率、外磁场、交换相互作用和晶场强度等诸多因素相互竞争,使系统表现出比恒定晶场作用的Blume-Capel模型更为丰富的磁学特性;外磁场能够增大系统格点的磁化强度,导致系统的二级相变消失;负晶场的作用使系统发生一级相变;稀释晶场会抑制系统的磁化强度,导致其基态饱和值小于1.The magnetization of the mixed spin Blume-Capel model lattice points in the diluted crystal field on nanotubes was studied by using the effective field theory,and the relationships between the magnetization of the system lattice points and the value probability of the diluted crystal field,the external magnetic field and the crystal field were obtained.The results show that the magnetic properties of the system are more abundant than those of the constant crystal field under the competition of many factors such as value probability,external magnetic field,exchange interaction and crystal field strength.The external magnetic field can increase the magnetization intensity of the lattice points of the system,resulting in the disappearance of the second-order phase transition of the system.The negative crystal field makes the system undergo a phase transition.Diluting the crystal field will inhibit the magnetization of the system,resulting in its ground state saturation value less than 1.

关 键 词：外磁场 磁化强度 有效场理论 BLUME-CAPEL模型 纳米管 

分 类 号：TB383.1[一般工业技术—材料科学与工程] O482.5[理学—固体物理]