We report observation and detailed study of a new magnetic resonance specific to the orbitally ordered (antiferro-quadrupole) phase of strongly correlated heavy fermion metal CeB_6. In contrast to manganites, where orbital ordering leads to simultaneous lattice distortion and change of magnetic structure and thus modify the magnetic resonance modes [1], in CeB_6 (i) the low temperature orbital ordering occurs without change of the lattice constant and no magnetic order develops at the boundary between paramagnetic and orbitally ordered phases; and (ii) orbital ordering precedes formation of an antiferromagnetic phase at low temperatures (see [2, 3] and references cited therein).
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