Spin-Controlled Mott-Hubbard Bands in LaMnO3 Probed by Optical Ellipsometry

N. N. Kovaleva, A. V. Boris, C. Bernhard, A. Kulakov, A. Pimenov, A. M. Balbashov, G. Khaliullin, and B. Keimer
Phys. Rev. Lett. 93, 147204 – Published 1 October 2004

Abstract

Spectral ellipsometry is used to determine the dielectric function of an untwinned crystal of LaMnO3 in the range 0.5–5.6 eV at temperatures 50T300K. A pronounced redistribution of spectral weight is found at the Néel temperature TN=140K. The anisotropy of the spectral weight transfer matches the magnetic ordering pattern. A superexchange model quantitatively describes spectral weight transfer induced by spin correlations. This analysis implies that the lowest-energy transitions around 2 eV are intersite d-d transitions, and that LaMnO3 is a Mott-Hubbard insulator.

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  • Received 17 May 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.147204

©2004 American Physical Society

Authors & Affiliations

N. N. Kovaleva1,*, A. V. Boris1, C. Bernhard1, A. Kulakov1,*, A. Pimenov2, A. M. Balbashov3, G. Khaliullin1, and B. Keimer1

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • 2Experimentalphysik V, Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany
  • 3Moscow Power Engineering Institute, 105835 Moscow, Russia

  • *Also at the Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow distr., 142432 Russia

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Vol. 93, Iss. 14 — 1 October 2004

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