Noninteracting Band Model for Dielectric Screening in Transition Metals: Application to Paramagnetic Nickel

Citations Over TimeTop 12% of 1970 papers

Abstract

The static dielectric function is studied for a transition metal on the basis of a model band structure with noninteracting $s$ and $d$ bands. The free-electron approximation is used for electrons in the $s$ band, while a simplified tight-binding scheme is used for the $d$ electrons. Explicit expressions are obtained for the intraband and interband contributions to the dielectric function. The model is applied to calculate the static dielectric function for paramagnetic nickel for ${(3d)}^{9}{(4s)}^{1}$ and ${(3d)}^{9.4}{(4s)}^{0.6}$ configurations along the three principal symmetry directions [100], [110], and [111]. The contributions due to the intraband and interband transitions are compared: It is found that the major contribution to the dielectric function is due to the intraband transitions.

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