Coexistence of spin-canting, metamagnetism, and spin-flop in a (4,4)   layered manganese azide polymer

doi:10.1021/cm0521830

CORC > 北京大学 > 化学与分子工程学院

	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
关键词	SINGLE-CHAIN MAGNET WEAK FERROMAGNETISM CRYSTAL-STRUCTURES TETRAHALOFERRATE(III) IONS NEUTRON-DIFFRACTION MOLECULAR MAGNETS NI-II TRANSITION COMPLEXES SYSTEM
DOI	10.1021/cm0521830
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.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000233846100024&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; Chemistry, Physical; Materials Science, Multidisciplinary; SCI(E); EI; 122; ARTICLE; 25; 6369-6380; 17
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/253502]
专题	化学与分子工程学院
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.
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.
MLA	Wang, XY,et al."Coexistence of spin-canting, metamagnetism, and spin-flop in a (4,4) layered manganese azide polymer".chemistry of materials (2005).