Structure and physical properties of the layered iron oxychalcogenide BaFe2Se2O
Ivanovski, Valentin N.
Warren, J. B.
Frenkel, A. I.
Cekić, Božidar Đ.
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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.
Source:Physical Review B: Condensed Matter and Materials Physics, 2012, 86, 19
- Investigation of intermetallics and semiconductors and possible application in renewable energy sources (RS-171001)
- US DOE [DE-AC02-98CH10886], US Department of Energy [DE-FG02-03ER15476, DE-FG02-05ER15688]