Lattice mechanical properties of some fcc f-shell metals

A pseudopotential depending on an effective core radius is proposed to study the binding energy, equation of state, ion-ion interaction, phonon dispersion curves (q-space and r-space analysis), mode Gruneisen parameters and dynamical elastic constants of some fcc f-shell metals La, Yb, Cc and Th. The contribution of the s-like electrons is calculated in the second-order perturbation theory for the potential while d- and Mike electron is taken into account by introducing repulsive short-range Born-Mayer term. The parameter of the potential is evaluated by zero pressure condition. An excellent agreement between theoretical investigations and experimental findings is achieved which confirms the present formalism.