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Schwinger-boson mean-field theory of the Heisenberg ferrimagnetic spin chain
Wu, CJ; Chen, B; Dai, X; Yu, Y; Su, ZB; Wu, CJ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
1999
发表期刊PHYSICAL REVIEW B
ISSN0163-1829
卷号60期号:2页码:1057-1063
摘要The Schwinger-boson mean-field theory is applied to the quantum ferrimagnetic Heisenberg chain. There is a ferrimagnetic long-range order in the ground state. We observe two branches of the low-lying excitation and calculate the spin reduction, the gap of the antiferromagnetic branch, and the spin fluctuation at T=0 K. These results agree with the established numerical results quite well. At finite temperatures, the long-range order is destroyed because of the disappearance of the Bose condensation. The thermodynamic observables, such as the free energy, magnetic susceptibility, specific heat, and the spin correlation at T>0 K, are calculated. The T chi(uni) has a minimum at intermediate temperatures and the spin-correlation length behaves as T-1 at low temperatures. These qualitatively agree with the numerical results and the difference is small at low temperatures. [S0163-1829(99)07225-2].
部门归属Peking Univ, Dept Phys, Beijing 100871, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
关键词Low-temperature Properties Dynamics States Model
学科领域Physics
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收录类别SCI
WOS记录号WOS:000081563800050
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被引频次:53[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/13125
专题理论物理所1978-2010年知识产出
通讯作者Wu, CJ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
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GB/T 7714
Wu, CJ,Chen, B,Dai, X,et al. Schwinger-boson mean-field theory of the Heisenberg ferrimagnetic spin chain[J]. PHYSICAL REVIEW B,1999,60(2):1057-1063.
APA Wu, CJ,Chen, B,Dai, X,Yu, Y,Su, ZB,&Wu, CJ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China..(1999).Schwinger-boson mean-field theory of the Heisenberg ferrimagnetic spin chain.PHYSICAL REVIEW B,60(2),1057-1063.
MLA Wu, CJ,et al."Schwinger-boson mean-field theory of the Heisenberg ferrimagnetic spin chain".PHYSICAL REVIEW B 60.2(1999):1057-1063.
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