We have successfully synthesized a layered iron oxychalcogenide BaFe 2Se2O single crystal. This compound is built up of Ba and Fe-Se(O) layers alternatively stacked along the c axis. The Fe-Se(O) layers contain double chains of edge-shared Fe-Se(O) tetrahedra that propagate along the b axis and are bridged by oxygen along the a axis. Physical property measurements indicate that BaFe2Se2O is a semiconductor without the Curie-Weiss behavior up to 350 K. There is a possible long-range antiferromagnetic transition at 240 K, corresponding to the peak in specific-heat measurement, and two transitions at 115 K and 43 K where magnetic susceptibility drops abruptly. The magnetic entropy up to 300 K is much smaller than the expected value for Fe2+ in tetrahedral crystal fields and the Mössbauer spectrum indicates that long-range magnetic order is unlikely at 294 K. Our results suggest that BaFe2Se2O is a magnetic insulator at the borderline between a long-range antiferromagnetic spin ordering and possible spin dimerization. © 2012 American Physical Society.
CITATION STYLE
Lei, H., Ryu, H., Ivanovski, V., Warren, J. B., Frenkel, A. I., Cekic, B., … Petrovic, C. (2012). Structure and physical properties of the layered iron oxychalcogenide BaFe2Se2O. Physical Review B - Condensed Matter and Materials Physics, 86(19). https://doi.org/10.1103/PhysRevB.86.195133
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