Bond operator theory of Heisenberg ferrimagnetic spin chain

被引：7
|
作者：
Li, Yinxiang [1 ]
Chen, Bin [2 ]
机构：
[1] Univ Shanghai Sci & Technol, Sch Business, Shanghai 200093, Peoples R China
[2] Univ Shanghai Sci & Technol, Tin Ka Ping Coll Sci, Shanghai 200093, Peoples R China
来源：
PHYSICS LETTERS A | 2015年 / 379卷 / 05期
关键词：
Bond operator theory; Heisenberg ferrimagnetic chain; MEAN-FIELD THEORY; ANTIFERROMAGNETIC CHAINS;
D O I：
10.1016/j.physleta.2014.11.020
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The bond operator theory is applied to study Heisenberg ferrimagnetic spin chain. We observe four branches of excited spectrum, the gap of excited spectrum and energy spectrum at T = 0 K. The energy gap is 1.64, which agrees quite well with the established numerical results. At finite temperature, the energy gaps, uniform susceptibility, internal energy and specific heat are calculated respectively. These results qualitatively agree with numerical results by other methods quite well. (C) 2014 Elsevier B.V. All rights reserved.
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页码：407 / 411
页数：5
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