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Optical investigation of LaMnO 3 thin films: a study of the 2-eV band

Author

Listed:
  • A. Nucara
  • F. Miletto Granozio
  • M. Radovic
  • F. M. Vitucci
  • P. Maselli
  • R. Fittipaldi
  • A. Vecchione
  • P. Calvani

Abstract

We measure the transmittance of LaMnO 3 (LMO) thin films in the spectral range from 10 000 to 38 000 cm -1 as a function of temperature. The optical conductivity obtained from the transmittance data is decomposed into five Drude-Lorentz contributions: three of them show evident changes below the Néel temperature T N $\simeq$ 140 K. We discuss the band assignment in the framework of the tight-binding and of the orbitally degenerate Hubbard models. Our results ascribe the overall low-frequency spectrum of LMO to charge-transfer mechanisms involving the t 2g and e g electrons of the Mn ions, without invoking the presence of excitonic contributions. This finding definitely promotes a Mott-Hubbard scenario for LMO and provides an estimate of the Hamiltonian parameters. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2011

Suggested Citation

  • A. Nucara & F. Miletto Granozio & M. Radovic & F. M. Vitucci & P. Maselli & R. Fittipaldi & A. Vecchione & P. Calvani, 2011. "Optical investigation of LaMnO 3 thin films: a study of the 2-eV band," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 79(4), pages 435-441, February.
    • Handle: RePEc:spr:eurphb:v:79:y:2011:i:4:p:435-441
    DOI: 10.1140/epjb/e2011-10945-0
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