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arXiv 0907.1366cond-mat.str-el
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准一维磁体Ni2SiO4的低温磁结构

Low temperature magnetic structure of the quasi 1-dimensional magnet Ni2SiO4

R H Colman, T Fennell, C Ritter, G Lau, R J Cava, A S Wills

摘要:

Ni 2SiO 4,Liebenbernitrile,是准一维磁体的一个例子,由平行于b轴传播的Ni 2+(S = 1)离子的受抑角共享三角形组成。Ni 2SiO 4与橄榄石同构,橄榄石是一种常见的矿物,具有不同的组成Fe 2-xMgxSiO 4,并被描述为正交空间群Pnma。用恒波长粉末中子衍射研究了合成的Ni_2SiO_4多晶样品。衍射光谱收集以上和以下的反铁磁有序转变(TN ~ 34 K),并用于细化Ni 2SiO 4的原子和磁性结构。共表象理论被用来确定Neel转变后的磁结构和refined磁结构的证据铁磁和反铁磁链间的相互作用,和铁磁链内耦合。磁相互作用之间的竞争可以从磁矩偏离共线排列的倾斜中看出。

英文摘要:

Ni2SiO4, Liebenbergite, is an example of a quasi-one-dimensional magnet made up of frustrated corner sharing triangles of Ni2+ (S = 1) ions that propagate parallel to the b axis. Ni2SiO4 is isostructural with olivine, a common mineral of varying composition Fe2-xMgxSiO4, and is described in the orthorhombic space group Pnma. A synthetic polycrystalline sample of Ni2SiO4 was studied using constant wavelength powder neutron diffraction. Diffraction spectra were collected above and below the antiferromagnetic ordering transition (TN ~ 34 K) and were used to refine the atomic and magnetic structures of Ni2SiO4. Corepresentational theory was used to determine the symmetry-allowed magnetic structures after the Neel transition and the refned magnetic structure evidences both ferromagnetic and antiferromagnetic inter-chain interactions, and ferromagnetic intra-chain coupling. The competition between the magnetic interactions can be seen in the canting of the moments away from a collinear arrangement.

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