Abstract
The repulsive and electronic contributions to the phonon frequencies have been calculated for metallic lithium in the symmetry directions. It is shown that the former are truly negligible as is usually assumed. For the latter the energy wavenumber characteristic is calculated using the electron-ion matrix elements for energy conserving transitions on the Fermi surface and then extended, by fitting the elastic constants, to simulate, in turn, local and nonlocal approximations. It is demonstrated that the nonlocal approach is essential in a complete theory of transport properties and phonon frequencies. Also, the crossword in the (100) branches can be explained as a reflection of the electron-ion matrix element characteristic of lithium. There are indications that anisotropic effects in the electron-ion matrix element may be important and that perturbation theory may not be adequate in lithium metal.
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