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	Magnetism and thermodynamics of spin-1/2 heisenberg diamond chains in a magnetic field
	Gu, Bo; Su, Gang
刊名	Physical review b
	2007-05-01
卷号	75期号:17页码:16
ISSN号	1098-0121
DOI	10.1103/physrevb.75.174437
通讯作者	Su, gang(gsu@gucas.ac.cn)
英文摘要	The magnetic and thermodynamic properties of spin-1/2 heisenberg diamond chains are investigated in three different cases: (a) j(1), j(2), j(3)> 0 (frustrated), (b) j(1), j(3)< 0, j(2)>= 0 (frustrated), and (c) j(1), j(2)> 0, j(3)< 0 (nonfrustrated), where the bond coupling j(i) (i=1,2,3)> 0 stands for an antiferromagnetic (af) interaction, and < 0 for a ferromagnetic (f) interaction. the density-matrix renormalization-group (dmrg) technique is invoked to study the properties of the system in the ground state, while the transfer-matrix renormalization-group (tmrg) technique is applied to explore the thermodynamic properties. the local magnetic moments, spin-correlation functions, and static structure factors are discussed in the ground state for the three cases. it is shown that the static structure factor s(q) shows peaks at wave vectors q=a pi/3 (a=0,1,2,3,4,5) for different couplings in a zero magnetic field, which, however, in the magnetic fields where the magnetization plateau with m=1/6 pertains, exhibits the peaks only at q=0, 2 pi/3, and 4 pi/3, which are found to be couplings independent. the dmrg results of the zero-field static structure factor can be nicely fitted by a linear superposition of six modes, where two fitting equations are proposed. it is observed that the six modes are closely related to the low-lying excitations of the system. at finite temperatures, the magnetization, susceptibility, and specific heat show various behaviors for different couplings. the double-peak structures of the susceptibility, and specific heat against temperature are obtained, where the peak positions and heights are found to depend on the competition of the couplings. it is also uncovered that the xxz anisotropy of f and af couplings leads the system of case (c) to display quite different behaviors. in addition, the experimental data of the susceptibility, specific heat, and magnetization for the compound cu-3(co3)(2)(oh)(2) are fairly compared with our tmrg results.
WOS关键词	GROUND-STATE ; CRYSTAL-STRUCTURE ; S=1/2 ; CU3CL6(H2O)(2)CENTER-DOT-2H(8)C(4)SO(2) ; EXCHANGE ; BEHAVIOR ; TRIMER ; MODEL ; GAP ; 1D
WOS研究方向	Physics
WOS类目	Physics, Condensed Matter
语种	英语
出版者	AMERICAN PHYSICAL SOC
WOS记录号	WOS:000246890500103
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2382129
专题	中国科学院大学
通讯作者	Su, Gang
作者单位	Chinese Acad Sci, Grad Univ, Coll Phys Sci, Beijing 10049, Peoples R China
推荐引用方式 GB/T 7714	Gu, Bo,Su, Gang. Magnetism and thermodynamics of spin-1/2 heisenberg diamond chains in a magnetic field[J]. Physical review b,2007,75(17):16.
APA	Gu, Bo,&Su, Gang.(2007).Magnetism and thermodynamics of spin-1/2 heisenberg diamond chains in a magnetic field.Physical review b,75(17),16.
MLA	Gu, Bo,et al."Magnetism and thermodynamics of spin-1/2 heisenberg diamond chains in a magnetic field".Physical review b 75.17(2007):16.

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