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Spin interactions and magnetic order in the iron oxychalcogenides BaFe2Q2O

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arxiv 1902.09035 v2 pith:4AW4HZD3 submitted 2019-02-24 cond-mat.str-el

Spin interactions and magnetic order in the iron oxychalcogenides BaFe2Q2O

B. D. Coles , A. D. Hillier , F. C. Coomer , N. C. Bristowe , S. Ramos , E. E. McCabe This is my paper
classification cond-mat.str-el
keywords ironmagneticoxychalcogenidesbafe2q2obafe2q3chalcogenidesinteractionsability
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The ability to tune the iron chalcogenides BaFe2Q3 from Mott insulators, to metals and then superconductors with applied pressure has renewed interest in low-dimensional iron chalcogenides and oxychalcogenides. We report here a combined experimental and theoretical study on the iron oxychalcogenides BaFe2Q2O (Q=S, Se) and show that their magnetic behaviour results from nearest-neighbour magnetic exchange interactions via oxide and selenide anions of similar strength, with properties consistent with more localised electronic structures than those of BaFe2Q3 systems.

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