Observation of orbital ordering and Jahn-Teller distortions supporting the Wigner-crystal model in highly doped Bi1-xCaxMnO3 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2007

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

Résumé

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.
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hal-00134833 , version 1 (05-03-2007)

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Stéphane Grenier, V. Kiryukhin, S.-W. Cheong, B.G. Kim, J.P. Hill, et al.. Observation of orbital ordering and Jahn-Teller distortions supporting the Wigner-crystal model in highly doped Bi1-xCaxMnO3. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2007, 75, pp.085101. ⟨10.1103/PhysRevB.75.085101⟩. ⟨hal-00134833⟩

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