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MM: Fachverband Metall- und Materialphysik

MM 13: Microstructure and Phase Transformations - Processing and Imaging

MM 13.4: Vortrag

Montag, 16. März 2020, 16:30–16:45, IFW B

Hidden charge order in an iron oxide square-lattice compound — •Darren C. Peets^1,2,3, Jung-Hwa Kim¹, Manfred Reehuis⁴, Peter Adler⁵, Andrey Maljuk^1,6, Tobias Ritschel³, Morgan C. Allison³, Jochen Geck³, Jose R. L. Mardegan⁷, Pablo J. Bereciartua Perez⁷, Sonia Francoual⁷, Andrew C. Walters¹, Thomas Keller^1,8, Paula M. Abdala⁹, Philip Pattison^9,10, 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 T_CO∼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.