CALCULATIONS OF THE SPIN SUSCEPTIBILITIES AND THEIR VOLUME DEPENDENCE FOR LI, NA, AND K

For a range of lattice parameters the Kohn-Sham equations were solved self-consistently in the muffin-tin and local spin density approximations for Li, Na, and K metals. The solutions were used to evaluate the spin susceptibilities chi //p via the variational principle of S. H. Vosko and J. P. Perdew for two choices of chi //h. For Li and K the volume dependence and absolute values of chi //p are in excellent agreement with experiment whereas for Na the RPA seems to be better. Calculations for K over an extended range of volumes show that non-linearity in chi //p sets in V/V//o equals 0. 9.