Magnetic order and phase transition in the iron oxysulfide La2O2Fe2OS2
Reeya K. Oogarah, Emmanuelle Suard, Emma E. McCabe
TL;DR
This study investigates the magnetic ordering in the iron oxychalcogenide La2O2Fe2OS2 using neutron diffraction, revealing a complex antiferromagnetic structure and the onset of magnetic order below 105 K.
Contribution
It provides detailed insights into the magnetic structure and microstructure of La2O2Fe2OS2, highlighting the robustness of the multi-k vector '2k' magnetic structure in iron oxychalcogenides.
Findings
Orders antiferromagnetically below 105 K
Adopts multi-k vector '2k' magnetic structure
Similar magnetic behavior to related compounds
Abstract
The Mott-insulating iron oxychalcogenides exhibit complex magnetic behaviour and we report here a neutron diffraction investigation into the magnetic ordering in La2O2Fe2OS2. This quaternary oxysulfide adopts the anti-Sr2MnO2Sb2-type structure and orders antiferromagnetically below TN = 105 K. We consider both its long-range magnetic structure and its magnetic microstructure, and the onset of magnetic order. It adopts the multi-k vector "2k" magnetic structure (k = (0.5 0 0.5) and k = (0 0.5 0.5) and has similarities with related iron oxychalcogenides, illustrating the robust nature of the "2k" magnetic structure.
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