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- Title
Optical investigation of LaMnO thin films: a study of the 2-eV band.
- Authors
Nucara, A.; Miletto Granozio, F.; Radovic, M.; Vitucci, F. M.; Maselli, P.; Fittipaldi, R.; Vecchione, A.; Calvani, P.
- Abstract
We measure the transmittance of LaMnO (LMO) thin films in the spectral range from 10 000 to 38 000 cm 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 $\simeq$ 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 and e 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.
- Subjects
LANTHANUM; MANGANESE oxides; THIN films; TEMPERATURE; HUBBARD model; FREQUENCY spectra; CHARGE transfer; ELECTRONS; HAMILTONIAN systems
- Publication
European Physical Journal B: Condensed Matter, 2011, Vol 79, Issue 4, p435
- ISSN
1434-6028
- Publication type
Article
- DOI
10.1140/epjb/e2011-10945-0