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

A. Nucara (), F. Miletto Granozio, M. Radovic, F. M. Vitucci, P. Maselli, R. Fittipaldi, A. Vecchione and P. Calvani

The European Physical Journal B: Condensed Matter and Complex Systems, 2011, vol. 79, issue 4, 435-441

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

Date: 2011
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DOI: 10.1140/epjb/e2011-10945-0

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