Addendum to the lattice dynamics ofγ-Ce

Inelastic neutron scattering techniques have been used to study the temperature dependence of the dispersion curves of $\gamma$-Ce. We find that the frequencies of all but the $T\left[111\right]\mathrm{}$ branches exhibit normal temperature dependence. Close to the zone boundary the frequencies of the $T\left[111\right]\mathrm{}$ branch, on the other hand, decrease with decreasing temperature, and at room temperature this branch exhibits a dip at the zone boundary. This anomalous behavior may be related to the $\mathrm{fcc}\to \mathrm{dhcp}$ phase transition.