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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 |
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| Cite this article: |
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LIANG Ya-Qiu, WEI Guo-Zhu, ZHANG Q et al 2004 Chin. Phys. Lett. 21 378-381 |
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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.
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| Keywords:
75.10.Dg
75.10.Jm
75.40.Cx
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Published: 01 February 2004
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| PACS: |
75.10.Dg
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(Crystal-field theory and spin Hamiltonians)
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75.10.Jm
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(Quantized spin models, including quantum spin frustration)
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75.40.Cx
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(Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.))
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