Quasi-two-dimensional non-collinear magnetism in the Mott insulator Sr2F2Fe2OS2
Abstract
The magnetism of Sr2F2Fe2OS2 was examined through neutron powder diffraction and thermodynamic and transport measurements. Quasi-two-dimensional magnetic order develops below TN = 106(2) K with an in-plane correlation length exceeding 310 \ and an out-of-plane correlation length of just 17(3) . The data are consistent with a two-k structure with k1 = (1/2, 0, 1/2) and k2 = (0, 1/2, 1/2) and an ordered moment of 3.3(1) μB oriented along the in-plane components of k. This structure is composed of orthogonal AFM chains intersecting at super-exchange mediating O sites. Density Functional Theory (DFT) also points to this structure and a narrower Fe 3d band than for the iron pnictides from which electronic correlations produce a Mott insulator.
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