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	Thermodynamics of spin-12 tetrameric heisenberg antiferromagnetic chain
	Gong, Shou-Shu1; Gao, Song2; Su, Gang1
刊名	Physical review b
	2009-07-01
卷号	80期号:1页码:10
关键词	Antiferromagnetism Heisenberg model Luttinger liquid Magnetic susceptibility Magnetic transition temperature Magnetisation Renormalisation Specific heat
ISSN号	1098-0121
DOI	10.1103/physrevb.80.014413
通讯作者	Su, gang(gsu@gucas.ac.cn)
英文摘要	The thermodynamic properties of a spin s=1/2 tetrameric heisenberg antiferromagnetic chain with alternating interactions af(1)-af(2)-af(1)-f (af and f denote the antiferromagnetic and ferromagnetic couplings, respectively) are studied by means of the transfer-matrix renormalization-group method and jordan-wigner transformation. it is found that in the absence of magnetic field, the thermodynamic behaviors are closely related to the gapped low-lying excitations, and a novel structure with three peaks in the temperature dependence of specific heat is unveiled. in a magnetic field, a phase diagram in the temperature-field plane for the couplings satisfying j(af1)=j(af2)=j(f) is obtained, in which various phases are identified. the temperature dependence of thermodynamic quantities including the magnetization, susceptibility, and specific heat are studied to characterize the corresponding phases. it is disclosed that the magnetization has a crossover behavior at low temperature in the luttinger liquid phase, which is shown falling into the same class as that in the s=1 haldane chain. in the plateau regime, the thermodynamic behaviors alter at a certain field, which results from the crossing of two excitation spectra. by means of the fermion mapping, it is uncovered that the system has four spectra from fermion and hole excitations that are responsible for the observed thermodynamic behaviors.
WOS关键词	HALDANE-GAP ANTIFERROMAGNETS ; MATRIX RENORMALIZATION-GROUP ; BOND GROUND-STATES ; EXCITATION SPECTRUM ; MAGNETIC-FIELD ; S=1/2 ; PHASE ; BEHAVIOR ; SYSTEMS ; FERROMAGNETS
WOS研究方向	Physics
WOS类目	Physics, Condensed Matter
语种	英语
出版者	AMER PHYSICAL SOC
WOS记录号	WOS:000268617100068
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2401775
专题	中国科学院大学
通讯作者	Su, Gang
作者单位	1.Chinese Acad Sci, Grad Univ, Coll Phys Sci, Beijing 100049, Peoples R China 2.Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Gong, Shou-Shu,Gao, Song,Su, Gang. Thermodynamics of spin-12 tetrameric heisenberg antiferromagnetic chain[J]. Physical review b,2009,80(1):10.
APA	Gong, Shou-Shu,Gao, Song,&Su, Gang.(2009).Thermodynamics of spin-12 tetrameric heisenberg antiferromagnetic chain.Physical review b,80(1),10.
MLA	Gong, Shou-Shu,et al."Thermodynamics of spin-12 tetrameric heisenberg antiferromagnetic chain".Physical review b 80.1(2009):10.

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