Crystal structure and magnetic modulation in beta-Ce2O2FeSe2
Chun-Hai Wang, C. M. Ainsworth, S. D. Champion, G. A. Stewart, M. C., Worsdale, T. Lancaster, S. J. Blundell, Helen E. A. Brand, and John S. O., Evans
TL;DR
This study investigates the structure and magnetic properties of beta-Ce2O2FeSe2 using diffraction, spectroscopy, and relaxation techniques, revealing a new structural model, magnetic ordering below 86 K, and a modulated magnetic structure.
Contribution
It provides the first detailed structural and magnetic characterization of beta-Ce2O2FeSe2, including a new space group description and insights into its magnetic ordering and modulation.
Findings
New structural description in space group Pna21
Antiferromagnetic ordering below 86 K
Modulated magnetic structure with q = 0.444 bN*
Abstract
We report a combination of X-ray and neutron diffraction studies, Mossbauer spectroscopy and muon spin relaxation (muSR) measurements to probe the structure and magnetic properties of the semiconducting beta-Ce2O2FeSe2 oxychalcogenide. We report a new structural description in space group Pna21 which is consistent with diffraction data and second harmonic generation measurements and reveal an order-disorder transition on one Fe site at TOD ~ 330 K. Susceptibility measurements, Mossbauer and muSR reveal antiferromagnetic ordering below TN = 86 K and more complex short range order above this temperature. 12 K neutron diffraction data reveal a modulated magnetic structure with q = 0.444 bN*.
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