键稀疏和随机晶场作用的铁磁系统的三临界性质研究  

Study on the tricritical properties of bond-dilution ferromagnetic spin system with random crystal field

作　　者：邓玲玲[1] 张雅男[1] 

机构地区：[1]南京邮电学院光信息技术系

出　　处：《苏州大学学报（自然科学版）》2004年第4期60-63,共4页Journal of Soochow University(Natural Science Edition)

基　　金：江苏省高校自然科学重点基金资助项目(03KJA140117)

摘　　要：在伊辛模型的框架内考虑键稀疏和随机晶场作用的铁磁自旋系统的三临界特性,采用有效场理论推导磁化表达式,重点研究方格子的三临界特性随键稀疏和随机晶场的改变呈现出的一些新的变化,并给出了相应的相图.In the frame of Ising model, we investigate the critical properties of bond dilution ferromagnetic spin system with random crystal field and obtain the magnetization expressions by using effective field theory. Special emphasis is placed on tricritical properties of the square lattice. At the range of concern random concentration of crystal field and bond dilution,the present system shows some new critical properties,such as fluctuation of tricritical point. We discuss in detail the influence of two disorder factors on the critical properties and give phase diagram.

关 键 词：晶场 铁磁系统 临界性质 随机 格子 伊辛模型 临界特性 改变 作用 研究 

分 类 号：O734[理学—晶体学] O482