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双模随机同向晶场对spin-1和spin-1/2混合自旋纳米管中Blume-Capel模型平均磁化强度的影响
李晓杰,曹凤,李新军,董明慧,尹田田,苑光明,王学文
0
(齐鲁理工学院,济南 250200)
摘要:
利用有效场理论研究了纳米管上双模随机同向晶场中混合自旋Blume-Capel模型格点的平均磁化强度,得到了系统格点的平均磁化强度与双模随机晶场的取值概率、外磁场、晶场参数和晶场强度比值的关系。结果表明:取值概率、外磁场、交换相互作用、晶场强度比值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模型更为丰富的磁化现象;双模随机同向晶场会抑制系统的平均磁化强度,使其基态饱和值小于5/6;外磁场导致系统的二级相变消失;一定条件下系统发生一级相变;系统的平均磁化强度呈现部分缺失和负值现象。
关键词:  外磁场  平均磁化强度  有效场理论  Blume-Capel模型  纳米管
DOI:10.13380/j.ltpl.02019.03.005
基金项目:
Effects of Two-mode Random Homotropic Crystal Fields on the Average Magnetization of the Blume-Capel Model in Spin-1 and Spin-1/2 Hybrid Spin Nanotubes
LIXiaoJie,CAOFeng,LIXinjun,DONGMinghui,YINTiantian,YUANGuangming,WANGXuewen
(Qilu Institute of Technology, Jinan, 250200)
Abstract:
The average magnetization of the lattice points in the hybrid spin Blume-Capel model in the dual-mode random homogeneous crystal field on the nanotube was studied by using the effective field theory, and the relationship between the average magnetization of the system lattice points and the value probability of the dual-mode random crystal field, the external magnetic field, the parameters of the crystal field and the intensity ratio of the crystal field was obtained. The results show that: the value probability, the external magnetic field, the exchange interaction, the ratio of crystal field strength and the strength of crystal field are in competition with each other, which makes the system show more abundant magnetization phenomenon than the constant crystal field effect of Blume-Capel model. The average magnetization of the system will be inhibited by the two-mode random homomorphic crystal field, and the saturation value of the ground state will be less than 5/6. The external magnetic field causes the second order phase transition of the system to disappear. Under certain conditions, the system undergoes a first order phase transition. The mean magnetization of the system showed partial missing and negative values.
Key words:  external magnetic field, average magnetization, effective field theory, Blume-Capel model, nanotube

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