Pseudopotential and the Phonon Dispersion in Aluminum

The phonon-dispersion curves, binding energy, and compressibility of aluminum have been calculated using the pseudopotential approach involving two adjustable parameters in the model pseudopotential. An exponential term of the type $e^{-pq}$ is introduced in the repulsive part of the pseudopotential so that it vanishes rapidly outside the ion core. The exchange and the correlation effects in the Hartree dielectric function have been adequately considered. Comparison with the experimental data shows good agreement.