最近邻弱交换相互作用对纳米管中Blume-Capel模型热学性质影响的研究  

Research on the influences of nearest neighbor weak exchange interaction on the thermal properties of Blume-Capel model in nanotube

作　　者：李晓杰 刘萍 李新军 LI Xiao-Jie;LIU Ping;LI Xin-Jun(Qilu Institute of Technology,Jinan 250200,China;QiLu Normal University,Jinan 250200,China)

机构地区：[1]齐鲁理工学院,济南250200 [2]齐鲁师范学院,济南250200

出　　处：《原子与分子物理学报》2021年第3期50-55,共6页Journal of Atomic and Molecular Physics

基　　金：齐鲁理工学院科技计划(QL19K060)。

摘　　要：利用有效场理论研究了纳米管上最近邻弱交换相互作用下spin-1纳米管中Blume-Capel(BC)模型的内能、比热和自由能,得到了系统的内能、比热和自由能与最近邻弱交换相互作用和晶场的关系.结果表明:最近邻弱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J_(1)=J_(2)=J=1时的BC模型更为复杂的热学性质;系统内能随温度的变化曲线表现出不连续性;比热随温度的变化出现奇异性;高温对自由能的影响更加明显.Using the effective field theory,the internal energy,specific heat and free energy of Blume-Capel(BC) model in spin-1 nanotube under the interaction of nearest-neighbor weak exchange are studied,and the relationships between the internal energy,specific heat and free energy of the system and the interaction and crystal field of nearest-neighbor weak exchange are obtained. The results show that the thermal properties of the system are more complex than those of the BC model at the time of J_(1)=J_(2)=J=1 due to the competition between the weak exchange interaction of the nearest neighbor and the strength of the crystal field. The curve of energy change with temperature shows discontinuity. The specific heat curve presents singularities. The effect of high temperature on free energy is more obvious.

关 键 词：最近邻弱交换相互作用 有效场理论 BLUME-CAPEL模型 纳米管 

分 类 号：O65[理学—分析化学]