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Abstract:
Pure powder and small single crystals of BaFe2S2O were obtained by
solid-state reaction between BaO, Fe, and S in closed silica ampoules.
The crystal structure contains a magnetic ladderlike sublattice of
high-spin Fe2+ (d(6)) tetrahedrally coordinated by three S and one O
atoms. Strong antiferromagnetic spin interactions are observed far above
the Neel transition (T-N = 260 K). Fe-57 Mossbauer spectra show typical
features of Fe2+ as a doublet with large quadrupole splitting above T-N
and combined electric and magnetic hyperfine interaction in the
magnetically ordered phase. A structural transition upon the magnetic
order is discussed.