Spin and orbital excitation spectrum in the Kugel-Khomskii model

Details Spin and orbital excitation spectrum in the Kugel-Khomskii model Spin and orbital excitation spectrum in the Kugel-Khomskii model

1997-10-08

arxiv.org/abs/cond-mat/9710070v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages with 3 PS figures, 1 table, RevTeX, accepted to Phys. Rev. B. Rapid Communication

Scientific paper

10.1103/PhysRevB.56.R14243

We discuss spin and orbital ordering in the twofold orbital degenerate superexchange model in three dimensions relevant to perovskite transition metal oxides. We focus on the particular point on the classical phase diagram where orbital degeneracy is lifted by quantum effects exclusively. Dispersion and damping of the spin and orbital excitations are calculated at this point taking into account their mutual interaction. Interaction corrections to the mean-field order parameters are found to be small. We conclude that quasi-one-dimensional Neel spin order accompanied by the uniform d_{3z^2-r^2}-type orbital ordering is stable against quantum fluctuations.

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