Lattice dynamics of CePd3

The room-temperature phonon-dispersion curves of the mixed-valent compound CePd3 were measured by inelastic neutron scattering techniques. No significant anomalies in either the phonon frequencies or in the widths of the measured neutron groups were observed. The phonon spectrum of CePd3 resembles closely those of CeSn3 and LaSn3. It is estimated that any lifetime effects due to the electron-phonon coupling in CePd3 are certainly smaller than approximately 0.15 THz at room temperature. The force constants obtained by fitting the experimental data to a three-nearest-neighbor Born--von Karman model were used to evaluate the phonon density of states, the lattice specific heat, and the atomic temperature factors of Ce and Pd in CePd3