MIXED-SPIN ISING-MODEL ON THE BETHE LATTICE

被引：45
|
作者：
DASILVA, NR [1 ]
SALINAS, SR [1 ]
机构：
[1] UNIV SAO PAULO,INST FIS,BR-01498 SAO PAULO,BRAZIL
来源：
PHYSICAL REVIEW B | 1991年 / 44卷 / 02期
关键词：
D O I：
10.1103/PhysRevB.44.852
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We obtain the phase diagram of a ferromagnetic mixed Ising system, consisting of spin-1/2 and spin-S variables, on a Bethe lattice of coordination number z, with nearest-neighbor exchange interactions and single-ion terms. The problem is formulated as a discrete nonlinear map. There is a tricritical point for S integer and z greater-than-or-equal-to 5. In the infinite-coordination-number limit, we regain the results of an exact calculation for a Curie-Weiss version of the model.
引用
收藏
页码：852 / 855
页数：4
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