Longitudinal-Random-Field Mixed Ising Model with Arbitrary Spins

The longitudinal-random-fieM mixed Ising model consisting of arbitrary spin values has been studied by the use of an effective field theory with correlations （EFT）. The phase diagrams of systems with mixed spins： σ = 1/2, S = 1; σ = 1/2, S = 3/2 are plotted. Not only the discontinuity at T = 0 K, is...

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Bibliographic Details
Published in:Communications in theoretical physics 2010-05, Vol.53 (5), p.957-962
Main Author: LIANG Ya-Qiu WEI Guo-Zhu XU Xiao-Juan SONG Guo-Li
Format: Article
Language:English
Subjects:
伊辛模型
有效场理论
混合自旋系统
纵向分布
自旋值
配位数
随机场
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Summary:The longitudinal-random-fieM mixed Ising model consisting of arbitrary spin values has been studied by the use of an effective field theory with correlations （EFT）. The phase diagrams of systems with mixed spins： σ = 1/2, S = 1; σ = 1/2, S = 3/2 are plotted. Not only the discontinuity at T = 0 K, is found when both longitudinal fields are trimodal distributed, but also the trieritical behavior is observed in these phase diagrams between the bimodal and trimodal distributions of longitudinal fields, which is different from the single-spin one. The appearance of tricritical point is independent of the coordination number and spin values.
ISSN:0253-6102
DOI:10.1088/0253-6102/53/5/32