Spin and mixed spin-and-orbital excitations in LaMnO 3

We investigate the stability of antiferromagnetic phases at Hund's exchange coupling between two e g electrons J H = 0 in a model of LaMnO 3, and derive spin and mixed spin-and-orbital excitations for either x 2 - y 2 or 3 z 2 - r 2 orbitals occupied. It is found that the superexchange due to t...

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Bibliographic Details
Published inPhysica. B, Condensed matter Vol. 378; pp. 552 - 553
Main Authors Sikora, Olga, Oleś, Andrzej M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 2006
Subjects
Manganites
Orbital order
Spin waves
Spin waves
75.47.Lx
75.50.Ee
Orbital order
Manganites
75.30.Et
75.30.Ds
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Summary:We investigate the stability of antiferromagnetic phases at Hund's exchange coupling between two e g electrons J H = 0 in a model of LaMnO 3, and derive spin and mixed spin-and-orbital excitations for either x 2 - y 2 or 3 z 2 - r 2 orbitals occupied. It is found that the superexchange due to t 2 g electron excitations and the charge transfer processes in the superexchange remove the divergence of quantum corrections and stabilize both ordered phases.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2006.01.449