Structure and physical properties of new layered iron oxychalcogenide BaFe2OSe2

Abstract

We have successfully synthesized a new layered iron oxychalcogenide BaFe2OSe2 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 BaFe2OSe2 is a semiconductor without the Curie-Weiss behavior up to 350 K. There is a possible long range antiferromagnetic (AFM) transition at 240 K, corresponding to the peak in specific heat measurement and two glassy transitions at 115 K and 43 K. The magnetic entropy up to 300 K is much smaller than the expected value for Fe2+ in tetrahedral crystal fields and Mosbauer spectrum indicates that long range magnetic order is unlikely at 294 K. Both results suggest that a short range magnetic correlations exist above the room temperature.

6 pages, 6 figures, 2 tables

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Cited by in corpus (8)

• Block magnetic excitations in the orbitally selective Mott insulator BaFe2Se3
• Magnetic and Structural Properties of the Iron Oxychalcogenides La${}_2$O${}_2$Fe${}_2$O$M_2$ ($M$= S, Se)
• (CaO)(FeSe): A Layered Wide Gap Oxychalcogenide Semiconductor
• Phonon and magnetic dimer excitations in Fe-based S=2 spin ladder compound BaFe${}_2$Se${}_2$O
• Electron Correlation and Spin Dynamics in Iron Pnictides and Chalcogenides
• Spin interactions and magnetic order in the iron oxychalcogenides BaFe2Q2O
• Machine Learning approach to muon spectroscopy analysis
• Chemistry and physics of layered oxychalcogenides containing an anti-cuprate type square lattice