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.
- Publication:
-
Physical Review Letters
- Pub Date:
- November 2007
- DOI:
- 10.1103/PhysRevLett.99.206403
- arXiv:
- arXiv:0707.4388
- Bibcode:
- 2007PhRvL..99t6403G
- Keywords:
-
- 71.30.+h;
- 61.10.Nz;
- 71.27.+a;
- Metal-insulator transitions and other electronic transitions;
- X-ray diffraction;
- Strongly correlated electron systems;
- heavy fermions;
- Condensed Matter - Strongly Correlated Electrons
- E-Print:
- 5 pages