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Orbital ordering and orbital fluctuations in transition metal oxides
Author(s) -
Oleś Andrzej M.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301667
Subject(s) - condensed matter physics , transition metal , non bonding orbital , materials science , physics , chemistry , atomic orbital , quantum mechanics , electron , biochemistry , catalysis
We summarize some characteristic features of the frustrated magnetic interactions in spin‐orbital models adequate for cubic transition metal oxides with orbital degeneracy. A generic tendency towards dimerization, found already in the degenerate Hubbard model, is confirmed for t 2 g but not for e g systems. In the t 2 g case the quantum orbital fluctuations are more pronounced and contribute to a stronger competition between different magnetic and orbital states. Therefore the orbital liquid states exist in some undoped t 2 g systems, while in the manganites such states can be triggered only by doping.