具有单离子各向异性场的键稀疏混合横向伊辛自旋系统的相图(英文)  

THE PHASE DIAGRAMS OF THE BOND DILUTED MIXED ISING SPIN SYSTEM WITH A SINGLE - ION ANISOTROPY IN A TRANSVERSE FIELD

作　　者：晏世雷[1] 杨传章[1] 

机构地区：[1]苏州大学物理科学与技术学院,苏州215006

出　　处：《苏州大学学报（自然科学版）》1997年第2期75-80,共6页Journal of Soochow University(Natural Science Edition)

摘　　要：本文在有效场理论的框架内研究了具有单离子各向异性场的键稀疏混合横向伊辛自旋系统的相图。重点给出了蜂窝晶格的相图。如果负单离子各向异性场参数不大且横场值较小,我们观察到在目前的系统中重入相变可能发生。横场对重入相变行为的影响在本文中也进行了讨论。The phase diagrams of the bond diluted mixed /sing spin system with a single - ion anisotropy in a transverse field are investigated within the framework of the effective - field theory with correlations . Particular emphasis is given to the honeycomb lattice with coordination number Z = 3 for which phase diagrams are obtained. We observe that the reentrant transition may occur in the present system if single - ion anisotropy parameter is not large and if transverse field is small. The influence of a transverse field on the behaviors of the reentrant transition is discussed.

关 键 词：相图 伊辛自旋系统 蜂窝晶格 各向异性场 

分 类 号：O414.2[理学—理论物理]