# Spin interactions and magnetic order in the iron oxychalcogenides BaFe2Q2O

## TL;DR

This study investigates the magnetic interactions in BaFe2Q2O (Q=S, Se), revealing that their magnetic behavior stems from localised electronic structures influenced by nearest-neighbour exchange interactions involving oxide and selenide anions.

## Contribution

It provides combined experimental and theoretical insights into the magnetic properties of BaFe2Q2O, highlighting the role of localised electronic structures and specific exchange interactions.

## Key findings

- Magnetic behavior results from nearest-neighbour exchange interactions.
- Properties are consistent with more localised electronic structures.
- Similar strength of oxide and selenide mediated interactions.

## Abstract

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.