Dresden 2020 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 13: Microstructure and Phase Transformations - Processing and Imaging
MM 13.4: Talk
Monday, March 16, 2020, 16:30–16:45, IFW B
Hidden charge order in an iron oxide square-lattice compound — •Darren C. Peets1,2,3, Jung-Hwa Kim1, Manfred Reehuis4, Peter Adler5, Andrey Maljuk1,6, Tobias Ritschel3, Morgan C. Allison3, Jochen Geck3, Jose R. L. Mardegan7, Pablo J. Bereciartua Perez7, Sonia Francoual7, Andrew C. Walters1, Thomas Keller1,8, Paula M. Abdala9, Philip Pattison9,10, Pinder Dosanjh11, and Bernhard Keimer1 — 1MPI-FKF, 70569 Stuttgart — 2NIMTE, CAS, Ningbo, 315201 China — 3IFMP, TU Dresden, 01069 Dresden — 4HZB, 14109 Berlin — 5MPI-CPfS, 01187 Dresden — 6IFW, 01171 Dresden — 7DESY, 22603 Hamburg — 8MLZ, 85748 Garching — 9ESRF, 38042 Grenoble, France — 10EPFL, 1015 Lausanne, Switzerland — 11UBC, Vancouver, V6T 1Z1 Canada
We report Fe3+–Fe5+ charge order in square-lattice Sr3Fe2O7. The charge order is nearly invisible to state-of-the-art diffraction probes, despite its simple checkerboard structure, large amplitude, and high critical temperature TCO∼330 K. This arises from the highly-symmetric lattice structure of Sr3Fe2O7, combined with frustration of interlayer Coulomb interactions. We point out parallels to electronic nematicity and hidden order in d- and f-electron compounds with frustrated interactions.