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The correlated motion of electrons in the presence of strong orbitalfluctuations and correlations is investigated with respect to magneticcouplings and excitations in an orbitally degenerate ferromagnet. Introductionof the orbital degree of freedom results in a class of diagrams representingspin-orbital coupling which become particularly important near the orbitalordering instability. Low-energy staggered orbital fluctuation modes,particularly with momentum near (\pi/2,\pi/2,0) (corresponding to CE-typeorbital correlations), are shown to generically yield strong intrinsicallynon-Heisenberg (1-\cos q)^2 magnon self energy correction, resulting in no spinstiffness reduction, but strongly suppressed zone-boundary magnon energies inthe Gamma-X direction. The zone-boundary magnon softening is found to bestrongly enhanced with increasing hole doping and for narrow-band materials,which provides insight into the origin of zone-boundary anomalies observed inferromagnetic manganites.

Orbital fluctuations, spin-orbital coupling, and anomalous magnon softening in an orbitally degenerate ferromagnet