title: 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. In the stripe order system Bi0.31Ca0.69MnO3, hole-doped O states are orbitally ordered, at the same propagation vector as the Mn orbital ordering, but no oxygen charge stripes are found at this periodicity. In La7/8Sr1/8MnO3, we observe a 2p charge ordering described by alternating hole-poor and hole-rich MnO planes that is consistent with some of the recent predictions.
authors.affiliation: Institut Néel, CNRS & Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France.
authors.forename: S
authors.initials: S
authors.lastname: Grenier
authors.forename: K J
authors.initials: KJ
authors.lastname: Thomas
authors.forename: J P
authors.initials: JP
authors.lastname: Hill
authors.forename: U
authors.initials: U
authors.lastname: Staub
authors.forename: Y
authors.initials: Y
authors.lastname: Bodenthin
authors.forename: M
authors.initials: M
authors.lastname: García-Fernández
authors.forename: V
authors.initials: V
authors.lastname: Scagnoli
authors.forename: V
authors.initials: V
authors.lastname: Kiryukhin
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong
authors.forename: B G
authors.initials: BG
authors.lastname: Kim
authors.forename: J M
authors.initials: JM
authors.lastname: Tonnerre