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Spectroscopy of La0.5Sr1.5MnO4 orbital ordering: a cluster many-body calculation

  • Solid and Condensed State Physics
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Abstract.

Orbital ordering (OO) in La0.5Sr1.5MnO4 has been studied using soft X-ray resonant diffraction (SXRD) at the Mn L2,3 edges in combination with many-body cluster calculations. The SXRD intensity is modelled in second quantization using a small planar cluster consisting of a central active Mn site with first-neighbour shells comprising O and Mn sites. The effective Hamiltonian includes Slater-Koster parameters and charge transfer and electron correlation energies obtained from previous measurements on manganites. The energy dependence of the SXRD OO peak is calculated using the Jahn-Teller distortions of the oxygen octahedra and in-plane spin correlations as adjustable parameters. These contributions are clearly distinguished above the Néel temperature with a good spectroscopic agreement. The results also suggest a significant charge separation between the Mn sites.

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Authors and Affiliations

  1. European Synchrotron Radiation Facility, BP 220, 38043, Grenoble Cedex, France

    A. Mirone

  2. Diamond Light Source, Chilton, Didcot, OX11 0DE, UK

    S. S. Dhesi

  3. CCLRC Daresbury Laboratory, Warrington, WA4 4AD, UK

    G. van der Laan

Authors
  1. A. Mirone
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  2. S. S. Dhesi
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  3. G. van der Laan
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Correspondence to A. Mirone.

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Mirone, A., Dhesi, S. & van der Laan, G. Spectroscopy of La0.5Sr1.5MnO4 orbital ordering: a cluster many-body calculation. Eur. Phys. J. B 53, 23–28 (2006). https://doi.org/10.1140/epjb/e2006-00340-5

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  • DOI: https://doi.org/10.1140/epjb/e2006-00340-5

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