Since the discovery of charge disproportionation in the FeO2 square-lattice compound Sr3Fe2O7 by Mössbauer 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.
Description
Phys. Rev. Lett. 127, 097203 (2021) - Hidden Charge Order in an Iron Oxide Square-Lattice Compound
%0 Journal Article
%1 PhysRevLett.127.097203
%A Kim, Jung-Hwa
%A Peets, Darren C.
%A Reehuis, Manfred
%A Adler, Peter
%A Maljuk, Andrey
%A Ritschel, Tobias
%A Allison, Morgan C.
%A Geck, Jochen
%A Mardegan, Jose R. L.
%A Bereciartua Perez, Pablo J.
%A Francoual, Sonia
%A Walters, Andrew C.
%A Keller, Thomas
%A Abdala, Paula M.
%A Pattison, Philip
%A Dosanjh, Pinder
%A Keimer, Bernhard
%D 2021
%I American Physical Society
%J Phys. Rev. Lett.
%K b
%N 9
%P 097203
%R 10.1103/PhysRevLett.127.097203
%T Hidden charge order in an iron oxide square-lattice compound
%U https://link.aps.org/doi/10.1103/PhysRevLett.127.097203
%V 127
%X Since the discovery of charge disproportionation in the FeO2 square-lattice compound Sr3Fe2O7 by Mössbauer 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.
@article{PhysRevLett.127.097203,
abstract = {Since the discovery of charge disproportionation in the FeO2 square-lattice compound Sr3Fe2O7 by Mössbauer 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.},
added-at = {2022-05-10T15:27:27.000+0200},
author = {Kim, Jung-Hwa and Peets, Darren C. and Reehuis, Manfred and Adler, Peter and Maljuk, Andrey and Ritschel, Tobias and Allison, Morgan C. and Geck, Jochen and Mardegan, Jose R. L. and Bereciartua Perez, Pablo J. and Francoual, Sonia and Walters, Andrew C. and Keller, Thomas and Abdala, Paula M. and Pattison, Philip and Dosanjh, Pinder and Keimer, Bernhard},
biburl = {https://www.bibsonomy.org/bibtex/25314943815dbae5ccabcef4537b375bd/ctqmat},
day = 27,
description = {Phys. Rev. Lett. 127, 097203 (2021) - Hidden Charge Order in an Iron Oxide Square-Lattice Compound},
doi = {10.1103/PhysRevLett.127.097203},
interhash = {f54f5743526966926cd4cb65884c2fdc},
intrahash = {5314943815dbae5ccabcef4537b375bd},
journal = {Phys. Rev. Lett.},
keywords = {b},
month = {08},
number = 9,
numpages = {7},
pages = 097203,
publisher = {American Physical Society},
timestamp = {2023-03-22T11:50:33.000+0100},
title = {Hidden charge order in an iron oxide square-lattice compound},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.127.097203},
volume = 127,
year = 2021
}