Influence of Polarization of Conduction Electrons of Nickel on Its Optical Conductivity

The optical conductivity of a system of free electrons of metal is considered. Drude model and Lorentz classic oscillator model, in which the external specific electroconductivity of a metal is implied, are traditionally used for the study of optical properties of such a system. However, a matter is characterized by both its external specific electroconductivity and its internal specific electroconductivity. Just the internal electroconductivity is entered into the dielectric permeability of a matter in accordance with its definition and stipulates optical properties of such a matter. The traditional utilization of the external electroconductivity in return for the internal one in the dielectric permeability is the simplifying approximation, which does not take into account the polarization of free electrons. The internal specific electroconductivity of a system of free electrons of one conduction band of a metal, which takes into account the polarization of such electrons, is considered. As demonstrated, the dependence of a real part of this internal electroconductivity on the light frequency has the appearance of a broad band. Only interband transitions of electrons are taken into account in this consideration. As shown, this band can be correlated with the maximum of optical conductivity, which is experimentally observed in nickel.