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题名: Schwinger-boson mean-field theory of the Heisenberg ferrimagnetic spin chain
作者: Wu, CJ ;  Chen, B ;  Dai, X ;  Yu, Y ;  Su, ZB
刊名: PHYSICAL REVIEW B
出版日期: 1999
卷号: 60, 期号:2, 页码:1057-1063
关键词: LOW-TEMPERATURE PROPERTIES ;  DYNAMICS ;  STATES ;  MODEL
学科分类: Physics
通讯作者: Wu, CJ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
部门归属: Peking Univ, Dept Phys, Beijing 100871, Peoples R China; Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要: 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].
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000081563800050
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/13125
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Recommended Citation:
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.
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