Abstract
The magnetism of SrFFeOS was examined through neutron powder diffraction and thermodynamic and transport measurements. Quasi-two-dimensional magnetic order develops below K with an in-plane correlation length exceeding 310 Å and an out-of-plane correlation length of just 17(3) Å. The data are consistent with a two-k structure with and and an ordered moment of 3.3(1) oriented along the in-plane components of k. This structure is composed of orthogonal antiferromagnetic chains intersecting at superexchange-mediating O sites. Density functional theory also points to this structure and a narrower Fe 3 band than for the iron pnictides from which electronic correlations produce a Mott insulator.
- Received 5 October 2012
DOI:https://doi.org/10.1103/PhysRevB.87.020406
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