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A spin-1/2 and spin-3/2 mixed Ising system in a random field is studied by the use of effective-field theory with correlations. The phase diagrams and thermal behaviours of magnetizations are investigated numerically for the honeycomb lattice (z=3) and square lattice (z=4) respectively. The tricritical behaviours for both honeycomb and square lattices, as well as the reentrant behaviour for the square lattice are found. 相似文献
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Phase Diagrams and Tricritical Behaviour of the Spin-2 Ising Model in a Longitudinal Random Field
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Within the framework of the effective-field theory with correlations,we study the ferromagnetic spin-2 randomfield 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. 相似文献
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