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	Coexistence of spin-canting, metamagnetism, and spin-flop in a (4,4) layered manganese azide polymer
	Wang, XY; Wang, L; Wang, ZM; Su, G; Gao, S
刊名	Chemistry of materials
	2005-12-13
卷号	17期号:25页码:6369-6380
ISSN号	0897-4756
DOI	10.1021/cm0521830
通讯作者	Gao, s()
英文摘要	A novel molecule-based magnetic polymer mn(n-3)(2)(btr)(2) 1 (btr = 4,4'-bi-1,2,4-triazole) was synthesized and characterized crystallographically and magnetically. i crystallizes in the monoclinic system, space group p2(1)/c, formula cgh(8)n(18)mn, with a = 12.283](4) angstrom, b = 6.3680(1) angstrom, c = 10.2245(3) angstrom, beta = 105.064(1)degrees, and z = 2. bridged by end-to-end azides, the mn2+ ions form a two-dimensional layer with (4,4) topology; the layers are further connected to the three-dimensional network by the weak hydrogen bonds between ligands of btr. magnetic studies on a polycrystalline sample show the existence of strong antiferromagnetic couplings between the adjacent mn2+ ions, and the neel temperature is t-n = 23.7 k. in the ordered state below tn, detailed investigations on an oriented single-crystal sample of i reveal that the hidden spin-canting, metamagnetic transition, and spin-flop transition can appear in different circumstances. the ground state is of an antiferromagnet with hidden spin-canting. an external field applied along the b direction parallel to the manganese azide layer can lead to a first-order metamagnetic phase transition, while a spin-flop transition may occur when the field is applied along the a* direction that is perpendicular to the manganese azide layer. magnetic phase diagrams in both the t-h-a* and the t-hi planes were determined. possible spin configurations before and after the transitions were proposed. analyses on the experimental data give the following intrinsic parameters: the intra- and interlayer coupling j approximate to -3.5 cm(-1) and j(a*) = 6 x 10(-4) cm(-1), the anisotropy field h-a = 0.2 koe, the exchange field h-e 387.8 koe, and the anisotropy parameter alpha = 5 x 10(-4). the small j(a*) and alpha show 1 to be a good example of a two-dimensional heisenberg system.
WOS关键词	SINGLE-CHAIN MAGNET ; WEAK FERROMAGNETISM ; CRYSTAL-STRUCTURES ; TETRAHALOFERRATE(III) IONS ; NEUTRON-DIFFRACTION ; MOLECULAR MAGNETS ; NI-II ; TRANSITION ; COMPLEXES ; SYSTEM
WOS研究方向	Chemistry ; Materials Science
WOS类目	Chemistry, Physical ; Materials Science, Multidisciplinary
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000233846100024
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2377491
专题	中国科学院大学
通讯作者	Gao, S
作者单位	1.Peking Univ, State Key Lab Rare Earth Mat Chem & Applicat, Coll Chem & Mol Engn, Beijing 100871, Peoples R China 2.Peking Univ, PKU, HKU ,Coll Chem & Mol Engn, Joint Lab Rare Earth Mat & Bioinorgan Chem, Beijing 100871, Peoples R China 3.Chinese Acad Sci, Coll Phys Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Wang, XY,Wang, L,Wang, ZM,et al. Coexistence of spin-canting, metamagnetism, and spin-flop in a (4,4) layered manganese azide polymer[J]. Chemistry of materials,2005,17(25):6369-6380.
APA	Wang, XY,Wang, L,Wang, ZM,Su, G,&Gao, S.(2005).Coexistence of spin-canting, metamagnetism, and spin-flop in a (4,4) layered manganese azide polymer.Chemistry of materials,17(25),6369-6380.
MLA	Wang, XY,et al."Coexistence of spin-canting, metamagnetism, and spin-flop in a (4,4) layered manganese azide polymer".Chemistry of materials 17.25(2005):6369-6380.

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