Orbital ordering in manganites in the band approach

D. V. Efremov and D. I. Khomskii
Phys. Rev. B 72, 012402 – Published 5 July 2005

Abstract

We consider the orbital ordering in LaMnO3 and similar systems, proceeding from the band picture. We show that for a realistic magnetic structure of A type there exists a complete nesting between two eg bands. As a result there occurs an instability toward an excitonic insulatorlike state—an electron-hole pairing with the wave vector Q=(π,π), which opens a gap in the spectrum and makes the system insulating. In the resulting state there appears an orbital ordering, the orbital density wave, the type of which coincides with those existing in LaMnO3.

  • Figure
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  • Received 4 March 2005

DOI:https://doi.org/10.1103/PhysRevB.72.012402

©2005 American Physical Society

Authors & Affiliations

D. V. Efremov1,2 and D. I. Khomskii3,2

  • 1Institut fur Theoretische Physik, TU Dresden, 01062 Dresden, Germany
  • 2Laboratory of Solid State Physics, Material Science Center, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
  • 3University of Cologne, Zuelpicher Strasse 77, 50937 Cologne, Germany

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Issue

Vol. 72, Iss. 1 — 1 July 2005

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