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Optical investigation of LaMnO3 thin films: a study of the 2-eV band

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Abstract.

We measure the transmittance of LaMnO3 (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.

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Authors and Affiliations

  1. CNR-SPIN and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale A. Moro 2, 00185, Roma, Italy

    A. Nucara, F. M. Vitucci, P. Maselli & P. Calvani

  2. CNR-SPIN and Dipartimento di Scienze Fisiche, Universitá degli Studi Federico II Complesso Universitario di Monte Sant’Angelo via Cinthia, 80126, Napoli, Italy

    F. Miletto Granozio & M. Radovic

  3. CNR-SPIN and Dipartimento di Fisica E.R. Caianiello, Università di Salerno, via Ponte don Melillo, 84084, Fisciano, Italy

    R. Fittipaldi & A. Vecchione

Authors
  1. A. Nucara
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  2. F. Miletto Granozio
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  3. M. Radovic
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  4. F. M. Vitucci
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  5. P. Maselli
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  6. R. Fittipaldi
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  7. A. Vecchione
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  8. P. Calvani
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Correspondence to A. Nucara.

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Nucara, A., Miletto Granozio, F., Radovic, M. et al. Optical investigation of LaMnO3 thin films: a study of the 2-eV band. Eur. Phys. J. B 79, 435–441 (2011). https://doi.org/10.1140/epjb/e2011-10945-0

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  • DOI: https://doi.org/10.1140/epjb/e2011-10945-0

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