Phonon Dispersion Relations of Body-Centered-Cubic Metals

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Abstract
A model calculation for the lattice dynamics of sodium and potassium is presented. The total adiabatic potential is represented by an electrostatic interaction among the ions, and a screened electron-ion interaction. The ion-electron-ion potential is represented by a two-parameter model potential. A modified Hartree dielectric function is used to account for exchange and correlation effects. The calculated dispersion curves for sodium and potassium are compared with the experimental neutron-scattering data. The results are also discussed in the light of other theoretical models.