Direct observation of oxygen superstructures in manganites

Abstract

We report the observation of superstructures associated with the oxygen 2p-states in two prototypical manganites using x-ray diffraction at the oxygen K-edge. We determine the nature of the orderings and discuss our picture with respect to novel theoretical models. In the stripe order system Bi0.31 Ca0.69 MnO3, hole-doped O states are found to be orbitally ordered, at the same propagation vector as the Mn orbital ordering, but no evidence is found to support a picture of oxygen charge stripes at this periodicity. In La 7/8 Sr 1/8 MnO3, we observe a 2p charge ordering described by alternating hole-poor and hole-rich MnO planes that is consistent with recent predictions.

5 pages

References in corpus (5)

• Orbital ordering in LaMnO${}_3$: Electron-electron versus electron-lattice interactions
• Resonant x-ray diffraction study of the magnetoresistant perovskite Pr0.6Ca0.4MnO3
• Oxygen-stripes in La0.5Ca0.5MnO3 from ab initio calculations
• Orbital polaron lattice formation in lightly doped La1-xSrxMnO3
• Quantum melting of the hole crystal in the spin ladder of Sr14-xCaxCu24O41

Cited by in corpus (5)

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• Direct observation of electron density reconstruction at the metal-insulator transition in NaOsO3