Structure and physical properties of the layered iron oxychalcogenide BaFe2Se2O
- Structure and physical properties of the layered iron oxychalcogenide BaFe2Se2O
- 류혜진; Hechang Lei; V. Ivanovski; J. B. Warren; A. I. Frenkel; B. Cekic; Wei-Guo Yin; C. Petrovic
- Issue Date
- Physical review B, Condensed matter and materials physics
- VOL 86, NO 19-195133-7
- We have successfully synthesized a layered iron oxychalcogenide BaFe2Se2O 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 Mossbauer 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.
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