Publisher's copyright statement:Reprinted with permission from the American Physical Society: Wang, Chun-Hai, Ainsworth, C. M., Champion, S. D., Stewart, G. A., Worsdale, M. C., Lancaster, T., Blundell, S. J., Brand, Helen E. A. Evans, John S. O. (2017). Crystal structure and magnetic modulation in Ce2O2FeSe2. Physical Review Materials 1(3): 034403 c 2017 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modi ed, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.Additional information:
Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. We report a combination of x-ray and neutron diffraction studies, Mössbauer spectroscopy, and muon spin relaxation (μ + SR) measurements to probe the structure and magnetic properties of the semiconducting β-Ce 2 O 2 FeSe 2 oxychalcogenide. We report a structural description in space group P na2 1 which is consistent with diffraction data and second harmonic generation measurements and reveal an order-disorder transition on one Fe site at T OD ≈ 330 K. Susceptibility measurements, Mössbauer, and μ + SR reveal antiferromagnetic ordering below T N = 86 K and more complex short range order above this temperature. 12 K neutron diffraction data reveal a modulated magnetic structure with q = 0.444b N * .