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Phys. Rev. B 75, 085101 (2007) [7 pages]

Observation of orbital ordering and Jahn-Teller distortions supporting the Wigner-crystal model in highly doped Bi1−xCaxMnO3

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S. Grenier
Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA and Institut Néel, C.N.R.S., 25 Avenue des Martyrs, BP 166, 38042, Grenoble cedex, France

V. Kiryukhin, S-W. Cheong, and B. G. Kim
Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA

J. P. Hill and K. J. Thomas
Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA

J. M. Tonnerre and Y. Joly
Institut Néel, C.N.R.S., 25 Avenue des Martyrs, BP 166, 38042, Grenoble cedex, France

U. Staub and V. Scagnoli
Swiss Light Source, Paul Sherrer Institute, 5232 Villigen, Switzerland

Received 24 August 2006; accepted 23 October 2006; published 5 February 2007

We report on the experimental characterization of orbital ordering and the associated lattice distortions in highly doped Bi1−xCaxMnO3. Resonant x-ray diffraction was used at the Mn L-edge for the direct observation of the ordered localized states, and at the Mn K-edge for the sensitivity to the distortions of the manganese-oxygen octahedra. The orbital ordering on Mn atoms was directly observed at x=0.69; the analysis and the numerical simulations of the K-edge spectra allow us to characterize the pattern of the distorted octahedra at x=4/5. These observations support the Wigner-crystal-type model at both dopings; the bi-stripe model is ruled out at x=0.69.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.75.085101
DOI:
10.1103/PhysRevB.75.085101
PACS:
71.30.+h, 71.20.Be, 78.70.Ck
 
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