Bosonic representation of one-dimensional Heisenberg ferrimagnets

被引：47
作者：
Yamamoto, S [1 ]
机构：
[1] Hokkaido Univ, Div Phys, Sapporo, Hokkaido 0600810, Japan
来源：
PHYSICAL REVIEW B | 2004年 / 69卷 / 06期
关键词：
D O I：
10.1103/PhysRevB.69.064426
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present a comparative study of bosonic languages to describe one-dimensional Heisenberg ferrimagnets. The ferrimagnetic Schwinger-boson mean-field theory demonstrated by Wu , the antiferromagnetic modified spin-wave theory designed by Takahashi, and its ferrimagnetic variant proposed by Yamamoto are employed to calculate the energy structure and the thermodynamics of various ferrimagnets. A modified spin-wave scheme, which introduces a Lagrange multiplier keeping the native energy structure free from temperature and thus differs from the original Takahashi scheme, is particularly stressed as a useful tool to investigate one-dimensional quantum ferrimagnetism. The antiferromagnetic limit of these descriptions is also considered.
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页数：9
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