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Comment: 5 pages, revtex, 2 figures, submitted to Phys. Rev. B more information at http://www.mpi-stuttgart.mpg.de/dokumente/andersen/fullerene/
Comment: 15 pages, LaTeX, 12 figures, uses jpsj.sty, revised version: some discussion to a related model and references added, submitted to the Journal of the Physical Society of Japan
Comment: 4 pages, 2 eps figures, to appear in J. Phys. Soc. Jpn. 68 No.6
Comment: 8 pages, 6 Postscript figures, REVTeX, submitted to Phys. Rev. B
The interplay between spin and orbital degrees of freedom in the Mott-Hubbard insulator is studied by considering an orbitally degenerate superexchange model. We argue that orbital order and the orbital excitation gap in this model are generated through the order-from-disorder mechanism known previously from frustrated spin models. We propose that the orbital gap should show up indirectly in the dynamical spin structure factor; it can therefore be measured using the conventional inelastic neutron scattering method.
Comment: Accepted for publication in Phys. Rev. Lett., 4 pages, Revtex, with 4 figures embedded
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