Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-07-08
2009 J. Phys.: Conf. Ser. 145 012037 (5pp)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 figures, 1 table, conference proceeding
Scientific paper
10.1088/1742-6596/145/1/012037
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.
Cava Robert. J.
Colman Ross H.
Fennell Tom
Lau G.
Ritter Clemens
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