Ground-State Phase Diagram of Transverse Spin-2 Ising Model with Longitudinal Crystal-Field  

作　　者：ZHAO Jie WEI Guo-Zhu XU Xing-Guang 

机构地区：[1]College of Science, Northeastern University, Shengyang 110006, China [2]College of Science, Liaoning University of Petroleum ＆ Chemical Technology, Fushun 113001, China

出　　处：《Communications in Theoretical Physics》2006年第4期749-753,共5页理论物理通讯（英文版）

摘　　要：The transverse spin-2 Ising ferromagnetic model with a longitudinal crystal-field is studied within the mean-field theory based on Bogoliubov inequality for the Gibbs free energy. The ground-state phase diagram and the tricritical point are obtained in the transverse field Ω/ zJ-longitudinal crystal D / zJ field plane. We find that there are the first order-order phase transitions in a very small range of D /zJ besides the usual first order-disorder phase transitions and the second order-disorder phase transitions,

关 键 词：transverse spin-2 Ising model longitudinal crystal field ground state phase diagram first orderorder phase transition 

分 类 号：O41[理学—理论物理]