Longitudinal-Random-Field Mixed Ising Model with Arbitrary Spins  

作　　者：梁雅秋 魏国柱 徐晓娟 宋国利 

机构地区：[1]School of Physics, Liaoning University [2]College of Science, Northeast University [3]Machinery Research Institute of Liaoning Province

出　　处：《Communications in Theoretical Physics》2010年第5期957-962,共6页理论物理通讯（英文版）

基　　金：Supported by the Research Fund of Education Department under Grant No. 2009A305;Science and Technology Department under Grant No. 20061023 in Liaoning Province of China;National Natural Science Foundation of China under Grant No. 10874062;National 211 Development Fund for Key Engineering Program of Liaoning University;Youth Foundation of Liaoning University under Grant No. 2007LDQN03

摘　　要：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.

关 键 词：mixed Ising model random field phase diagram tricritical point 

分 类 号：O481[理学—固体物理]