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Phys. Rev. Lett. 99, 206403 (2007) [4 pages]

Direct Observation of Oxygen Superstructures in Manganites

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S. Grenier1, K. J. Thomas2, J. P. Hill2, U. Staub3, Y. Bodenthin3, M. García-Fernández3, V. Scagnoli4, V. Kiryukhin5, S-W. Cheong5, B. G. Kim5,*, and J. M. Tonnerre1
1Institut Néel, CNRS & Université Joseph Fourier, BP 166, F-38042 Grenoble Cedex 9, France
2Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973, USA
3Swiss Light Source, Paul Sherrer Institut, 5232 Villigen, Switzerland
4European Synchrotron Radiation Facility, BP 220, F-38043 Grenoble Cedex 9, France
5Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 USA

Received 28 May 2007; published 15 November 2007

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.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.206403
DOI:
10.1103/PhysRevLett.99.206403
PACS:
71.30.+h, 61.10.Nz, 71.27.+a

*Present address: Department of Physics, Pusan National University, Pusan 609-735, Korea.

 
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