A relativistic model pseudopotential: Applied to Cs and Pb metals

The authors generalise a recently published energy-dependent model pseudopotential to derive a model pseudopotential including spin-orbit interaction for use in the relativistic calculation of the electronic properties of nontransition metals. In this work the derived model pseudopotential is used to calculate (i) the electrical resistivity of Cs and Pb metals in the liquid phase and (ii) the phonon spectra of Pb metal. It appears that (i) the spin-orbit interaction enhances the liquid's electrical resistivity by about 1% in Cs and about 7% in Pb and (ii) the spin-orbit effect on the phonon spectra of Pb is not at all as significant as was anticipated in the previously published work, being about 3%.