The Temperature Dependence of the g-Shifts of Conduction Electrons in Pure and Impure Alkali Metals.

摘要

The g-shifts of conduction electrons in pure and impure alkali metals have been calculated by taking the average over the Fermi surface along the (100), (110) and (111) directions. The conduction-electron wave functions are approximated by taking orthogonalized plane waves orthogonal to the core states and are the irreducible representations in the double group. The calculated g-shift for Li is -6 x 10 to the -5th power which is in satisfactory agreement with the experimental result -6.1 + or - 0.2 x 10 to the -5th power. The temperature dependence of the g-shift is obtained when the integration over the K-vector involves the Fermi-Dirac distribution. The g value for Li shifts only about 0.3% from a temperature of 4 to 500 K. The wave functions for the impure alkali metals are obtained by Bardeen expansion to second order around the center of the Brillouin zone. (Author)