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Spin and mixed spin-and-orbital excitations in

✍ Scribed by Olga Sikora; Andrzej M. Oleś

Publisher
Elsevier Science
Year
2006
Tongue
English
Weight
138 KB
Volume
378-380
Category
Article
ISSN
0921-4526

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✦ Synopsis

We investigate the stability of antiferromagnetic phases at Hund's exchange coupling between two e g electrons J H ¼ 0 in a model of LaMnO 3 , and derive spin and mixed spin-and-orbital excitations for either x 2 À y 2 or 3z 2 À r 2 orbitals occupied. It is found that the superexchange due to t 2g electron excitations and the charge transfer processes in the superexchange remove the divergence of quantum corrections and stabilize both ordered phases.

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