Journal Article

IMPULSE-2021-00283

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Hidden Charge Order in an Iron Oxide Square-Lattice Compound

Kim, J.-H. ; Peets, D. C. ; Reehuis, M. ; Adler, P. ; Maljuk, A. ; Ritschel, T. ; Allison, M. C. ; Geck, J. ; Mardegan, J. R. L. ; Bereciartua Perez, P. J. ; Francoual, S. ; Walters, A. C. ; Keller, T.MLZ* ; Abdala, P. M. ; Pattison, P. ; Dosanjh, P. ; Keimer, B. (Corresponding author)

2021
APS College Park, Md.

Please use a persistent id in citations: doi:10.1103/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.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. TRISP (TRISP)

Experiment(s):

1. TRISP: Three axes spin echo spectrometer (SR5b)

Appears in the scientific report 2021

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Database coverage:
; Clarivate Analytics Master Journal List ; Current Contents - Electronics and Telecommunications Collection ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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