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Crystal structure and magnetic modulation in β−Ce2O2FeSe2.

Wang, Chun-Hai and Ainsworth, C. M. and Champion, S. D. and Stewart, G. A. and Worsdale, M. C. and Lancaster, T. and Blundell, S. J. and Brand, Helen E. A. and Evans, John S. O. (2017) 'Crystal structure and magnetic modulation in β−Ce2O2FeSe2.', Physical review materials., 1 (3). 034403.


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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Publisher 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 β−Ce2O2FeSe2. Physical Review Materials 1(3): 034403 © 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, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:30 June 2017
Date deposited:20 September 2017
Date of first online publication:11 August 2017
Date first made open access:20 September 2017

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