最近邻交换相互作用对磁热性质和相变的影响研究  

The Effect of Nearest Neighbor Exchange Interaction on Magnetic and Thermal Properties and Phase Transitions

作　　者：李晓杰 李新军 张萌 LI Xiaojie;LI Xinjun;ZHANG Meng(Qilu Institute of Technology,Jinan 250200,China;Education and Sports Bureau of Zhangqiu District,Jinan 250200,China)

机构地区：[1]齐鲁理工学院,山东济南250200 [2]章丘区教育和体育局,山东济南250200

出　　处：《云南师范大学学报（自然科学版）》2022年第6期35-40,共6页Journal of Yunnan Normal University:Natural Sciences Edition

基　　金：齐鲁理工学院科技计划资助项目(QL19K060)。

摘　　要：利用有效场理论研究了纳米管上最近邻交换相互作用下纳米管中Blume-Capel模型的磁化强度、内能、比热和相变行为,得到了系统的磁热性质和相图.结果表明:最近邻交换相互作用和晶场强度等诸多因素相互竞争,使系统表现出复杂的磁热现象;一定条件下,系统相变可由二级相变转为一级相变;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;系统相图存在三临界点,且三临界点呈现一定的线性关系.Magnetization, internal energy, specific heat and phase transition behavior of Blume-Capel model in spin-1 nanotube under the interaction of nearest-neighbor exchange are studied by using effective field theory.Magnetic and thermal properties and phase diagrams of the system are obtained.The results show that many factors such as the nearest-neighbor exchange interaction and the intensity of crystal field compete with each other, so the system exhibits complex magneto-thermal phenomena.The curve of energy change with temperature shows discontinuity.The specific heat curve presents singularities.There are three critical points in the phase diagram, and the three critical points show a linear relationship.

关 键 词：最近邻交换相互作用 有效场理论 BLUME-CAPEL模型 磁热性质 

分 类 号：O482.5[理学—固体物理]