The role of orbital ordering in the formation of electron structure in undoped LaMnO{sub 3} manganites in the regime of strong electron correlations
Journal Article
·
· Journal of Experimental and Theoretical Physics
- Russian Academy of Sciences, Kirensky Institute of Physics, Siberian Division (Russian Federation)
- Siberian State Aerospace University (Russian Federation)
The electron structure of undoped LaMnO{sub 3} and slightly doped La{sub 1-x}Sr{sub x}MnO{sub 3} manganites has been calculated within the framework of a generalized tight binding method with explicit allowance for strong intraatomic electron correlations. According to the results of these calculations, the ground state in orbitally disordered undoped LaMnO{sub 3} ferromagnets would be metallic despite the Mott-Hubbard correlation gap in the spectrum of quasiparticles. Owing to the orbital ordering, the insulating state is stabilized in both antiferromagnetic and paramagnetic phases. In-gap states of a polaron nature with a spectral weight proportional to the dopant concentration have been found near the top of the valence band in La{sub 1-x}Sr{sub x}MnO{sub 3}. As the doping level increases, a metal state appears in the ferromagnetic phase, which has a metallic character for one spin subband and an insulating character for the other subband (representing the so-called half-metallic state)
- OSTI ID:
- 21055078
- Journal Information:
- Journal of Experimental and Theoretical Physics, Journal Name: Journal of Experimental and Theoretical Physics Journal Issue: 6 Vol. 102; ISSN JTPHES; ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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