Structural and magnetic characterisation of iron oxyselenides Ce2O2Fe2OSe2 and Nd2O2Fe2OSe2
Emma E. McCabe, Andrew S. Wills, Laurent Chapon, Pascal Manuel, John, S. O. Evans
TL;DR
This study investigates the magnetic properties of iron oxyselenides Ce2O2Fe2OSe2 and Nd2O2Fe2OSe2, revealing complex magnetic ordering and the magnetic behavior of lanthanide ions at low temperatures.
Contribution
It provides detailed neutron diffraction analysis of magnetic ordering and the role of lanthanide cations in these oxyselenide materials, which was previously not well understood.
Findings
Non-collinear multi-k magnetic ordering on Fe sublattice
Reduced magnetic correlation length perpendicular to layers
Ce3+ moments order below 16 K
Abstract
We present here an investigation of the magnetic ordering in the Mott insulating oxyselenide materials Ln2O2Fe2OSe2 (Ln = Ce, Nd). Neutron powder diffraction data are consistent with a non-collinear multi-k ordering on the iron sublattice structure and analysis indicates a reduced magnetic correlation length perpendicular to the [Fe2O]2+ layers. The magnetic role of the Ln3+ cations is investigated and Ce3+ moments are found to order for T < 16 K.
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Taxonomy
TopicsHigh-pressure geophysics and materials · Crystal Structures and Properties · Geomagnetism and Paleomagnetism Studies