双模随机交错晶场中最近邻弱交换相互作用对重入现象的影响  

The Effect of the Nearest Neighbor Weak Exchange Interaction on the Reentrant Phenomenon in the Bimodal Random Interleaved Crystal Field

作　　者：李晓杰 王渺渺 李新军 刘萍 陈文龙 LI XiaoJie;WANG Miaomiao;LI Xinjun;LIU Ping;CHEN Wenlong(Qilu Institute of Technology,Jinan,250200;Qilu Normal University Chinese Literature,Jinan,250200;Linyi normalschool,Dezhou,251500)

机构地区：[1]齐鲁理工学院,济南250200 [2]齐鲁师范学院文学院,济南250200 [3]临邑师范学校,德州251500

出　　处：《低温物理学报》2020年第1期38-44,共7页Low Temperature Physical Letters

基　　金：齐鲁理工学院科技计划项目(QL19K060)资助的课题.

摘　　要：利用有效场理论研究了双模随机交错晶场中混合自旋Blume-Capel模型纳米管系统的重入现象,发现了系统的重入现象与晶场取值概率、晶场强度和外壳层与内壳层格点间最近邻交换相互作用的关系.结果表明:取值概率、交换相互作用、晶场强度和温度等诸多因素相互竞争,使系统表现出丰富的磁化现象:正(负)晶场较弱时,系统只发生二级相变;随着正(负)晶场增强,系统的二级相变消失,呈现一级相变;一定条件下,系统会出现重入现象.Thereentrant phenomenon of hybridspin Blume-Capel nanotube system in a bimodal random staggered crystal field is studied by using the effective field theory.The results show that the system exhibits abundant magnetization due to the competition among various factors,such as value probability,exchange interaction,crystal field strength and temperature.With the enhancement of the positive(negative)crystal field,the second-order phasetransition disappeared and the first-order phase transition appeared.Under certain conditions,the system will present the reentrant phenomenon.

关 键 词：重入现象 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]