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Neutron scattering experiments have been performed on the ternary rare-earthdiborocarbide Ce$^{11}$B$_2$C$_2$. The powder diffraction experiment confirmsformation of a long-range magnetic order at $T_{\rm N} = 7.3$ K, where asinusoidally modulated structure is realized with the modulation vector ${\bmq} = [0.167(3), 0.167(3), 0.114(3)]$. Inelastic excitation spectra in theparamagnetic phase comprise significantly broad quasielastic and inelasticpeaks centered at $\hbar \omega \approx 0, 8$ and 65 meV.Crystalline-electric-field (CEF) analysis satisfactorily reproduces theobserved spectra, confirming their CEF origin. The broadness of thequasielastic peak indicates strong spin fluctuations due to coupling betweenlocalized $4f$ spins and conduction electrons in the paramagnetic phase. Aprominent feature is suppression of the quasielastic fluctuations, andconcomitant growth of a sharp inelastic peak in a low energy region below$T_{\rm N}$. This suggests dissociation of the conduction and localized $4f$electrons on ordering, and contrasts the presently observed incommensuratephase with spin-density-wave order frequently seen in heavy fermion compounds,such as Ce(Ru$_{1-x}$La$_x$)$_2$Si$_2$.

Neutron scattering study of magnetic ordering and excitations in the ternary rare-earth diborocarbide Ce^{11}B_2C_2