Phase Diagrams and Tricritical Behaviour of the Spin-2 Ising Model in a Longitudinal Random Field
LIANG Ya-Qiu1,2, WEI Guo-Zhu1,3, ZHANG Q1, SONG Guo-Li4
1College of Sciences, Northeastern University, Shenyang 110006
2Department of Physics, Liaoning University, Shengyang 110036
3International Center for Material Physics, Chinese Academy of Sciences, Shengyang 110016
4Machinery Research Institute of Liaoning Province, Shengyang 110032
Phase Diagrams and Tricritical Behaviour of the Spin-2 Ising Model in a Longitudinal Random Field
1College of Sciences, Northeastern University, Shenyang 110006
2Department of Physics, Liaoning University, Shengyang 110036
3International Center for Material Physics, Chinese Academy of Sciences, Shengyang 110016
4Machinery Research Institute of Liaoning Province, Shengyang 110032
Abstract： Within the framework of the effective-field theory with correlations, we study the ferromagnetic spin-2 random-field Ising model (RFIM) in the presence of a crystal field on honeycomb (z = 3), square (z = 4) and simple cubic (z = 6) lattices. The effects of the crystal field and the longitudinal random field on the phase diagrams are investigated. Some characteristic features of the phase diagrams, such as the tricritical phenomena, reentrant phenomena and existence of two tricritical points, are found.
LIANG Ya-Qiu;WEI Guo-Zhu;ZHANG Q;SONG Guo-Li. Phase Diagrams and Tricritical Behaviour of the Spin-2 Ising Model in a Longitudinal Random Field[J]. 中国物理快报, 2004, 21(2): 378-381.
LIANG Ya-Qiu, WEI Guo-Zhu, ZHANG Q, SONG Guo-Li. Phase Diagrams and Tricritical Behaviour of the Spin-2 Ising Model in a Longitudinal Random Field. Chin. Phys. Lett., 2004, 21(2): 378-381.
2004, Vol. 21 
