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  Hidden Charge Order in an Iron Oxide Square-Lattice Compound

Kim, J.-H., Peets, D. C., Reehuis, M., Adler, P., Maljuk, A., Ritschel, T., et al. (2021). Hidden Charge Order in an Iron Oxide Square-Lattice Compound. Physical Review Letters, 127(9): 097203, pp. 1-7. doi:10.1103/PhysRevLett.127.097203.

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 Creators:
Kim, Jung-Hwa1, Author
Peets, Darren C.1, Author
Reehuis, Manfred1, Author
Adler, Peter2, Author           
Maljuk, Andrey1, Author
Ritschel, Tobias1, Author
Allison, Morgan C.1, Author
Geck, Jochen1, Author
Mardegan, Jose R. L.1, Author
Perez, Pablo J. Bereciartua1, Author
Francoual, Sonia1, Author
Walters, Andrew C.1, Author
Keller, Thomas1, Author
Abdala, Paula M.1, Author
Pattison, Philip1, Author
Dosanjh, Pinder1, Author
Keimer, Bernhard1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Peter Adler, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863435              

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 Abstract: Since the discovery of charge disproportionation in the FeO2 square-lattice compound Sr3Fe2O7 by Mossbauer spectroscopy more than fifty years ago, the spatial ordering pattern of the disproportionated charges has remained "hidden" to conventional diffraction probes, despite numerous x-ray and neutron scattering studies. We have used neutron Larmor diffraction and Fe K-edge resonant x-ray scattering to demonstrate checkerboard charge order in the FeO2 planes that vanishes at a sharp second-order phase transition upon heating above 332 K. Stacking disorder of the checkerboard pattern due to frustrated interlayer interactions broadens the corresponding superstructure reflections and greatly reduces their amplitude, thus explaining the difficulty of detecting them by conventional probes. We discuss the implications of these findings for research on "hidden order" in other materials.

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Language(s): eng - English
 Dates: 2021-08-272021-08-27
 Publication Status: Published in print
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 Table of Contents: -
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 127 (9) Sequence Number: 097203 Start / End Page: 1 - 7 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1