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.
@article{arxiv.1902.09035,
title = {Spin interactions and magnetic order in the iron oxychalcogenides BaFe2Q2O},
author = {B. D. Coles and A. D. Hillier and F. C. Coomer and N. C. Bristowe and S. Ramos and E. E. McCabe},
journal= {arXiv preprint arXiv:1902.09035},
year = {2019}
}