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Wu, CJ; Chen, B; Dai, X; Yu, Y; Su, ZB; Wu, CJ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
Schwinger-boson mean-field theory of the Heisenberg ferrimagnetic spin chain
Source PublicationPHYSICAL REVIEW B
KeywordLow-temperature Properties Dynamics States Model
AbstractThe 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].
1999
ISSN0163-1829
Volume60Issue:2Pages:1057-1063
Subject AreaPhysics
Indexed BySCI
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/13125
Collection理论物理所科研产出_SCI论文
Corresponding AuthorWu, CJ , Peking Univ, Dept Phys, Beijing 100871, Peoples R China.
Recommended Citation
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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