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Synthesis and Characterization of Frustrated Spin Ladders SrFe2S2O and SrFe2Se2O

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Huh,  Sungjoon
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Prots,  Yurii
Yuri Prots, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Adler,  Peter
Peter Adler, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Tjeng,  Liu Hao
Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Valldor,  Martin
Martin Valldor, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Huh, S., Prots, Y., Adler, P., Tjeng, L. H., & Valldor, M. (2015). Synthesis and Characterization of Frustrated Spin Ladders SrFe2S2O and SrFe2Se2O. European Journal of Inorganic Chemistry, (18), 2982-2988. doi:10.1002/ejic.201500385.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0027-F3D8-9
Abstract
Chemical pressure was introduced by replacing Ba atoms with Sr atoms in the spin-ladder compounds AEFe(2)Ch(2)O (AE = Ba, Sr; Ch = S, Se). Powders and small single crystals of SrFe2S2O and SrFe2Se2O were synthesized from SrO, Fe, and Ch (S, Se). X-ray diffraction data were used to determine the crystal structures, which showed prominent magnetic ladderlike sublattices. The Mossbauer spectra of SrFe2S2O and SrFe2Se2O suggest the presence of localized divalent Fe ions in the FeCh(3)O structural units (distorted e(3)t(2)(3) configuration, S = 2). Single sharp hyperfine patterns at 5 K indicate the formation of simple antiferromagnetic ground states. The spin-ordering transitions (T-N) were determined by magnetic, resistivity, and specific heat data to be 216 and 228 K for SrFe2S2O and SrFe2Se2O, respectively. At ca. 540 K, both compounds exhibit a similar broad maximum in (T-max). In comparison with BaFe2S2O and BaFe2Se2O, the Sr homologues have higher T-max values, which suggest stronger intersite exchange interactions in accordance with the chemical pressure from the replacement of Sr atoms with Ba atoms. However, the lower Neel temperatures for the Sr homologues supports the idea that magnetic frustration is present, and it clearly has to be considered for this group of compounds.