Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 223, Issue 2, Pages 175-191Publisher
ELSEVIER
DOI: 10.1016/S0304-8853(00)00597-7
Keywords
manganites; Jahn-Teller effect; charge ordering; orbital ordering; magnetic structure; superexchange; spin waves
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This work is devoted to the description of the orbital and magnetic structures of pure and charge-ordered manganites, caused by crystal and charge structures and the Jahn-Teller effect. The model under consideration is based on the orbital dependency of the magnetic interactions in Jahn-Teller crystal. The orbital structure is considered dependent upon the Jahn-Teller distortions of the coordination of the Mn3+ ions and upon the crystal field. It is shown that exchange interactions forming the magnetic structure of the charge-ordered manganite could be described in the superexchange approximation because of localization of the charge carriers. For pure manganite and for charge-ordered phase, the exchange parameters dependencies and the single-ion anisotropy dependency, upon the angle of orbital states mixing, are drawn. Therefore, it is shown that the orbital structure of the charge-ordered phase is formed mainly by cooperative Jahn-Teller distortions and, taking into account the charge superstructure, causes the non-trivial magnetic structure. (C) 2001 Elsevier Science B.V. All rights reserved.
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