Optical properties and electronic structure of alloys Co2Cr1–xFexAl (x = 0, 0.4, 0.6, 1.0)

Abstract

The results of the investigation of the optical properties and calculations of the density of states N(E) of the Heusler alloys Co₂Cr_1–xFe_xAl (x = 0, 0.4, 0.6, 1.0) have been presented. It has been found that the band spectrum substantially changes, especially in the vicinity of the Fermi level, due to the concentration transition from Co₂FeAl to Co₂CrAl. These changes are accompanied by significant changes in the optical properties. The optical properties of the Co₂FeAl alloy are typical of metals. The anomalous behavior of the optical properties of the alloys with x = 0, 0.4, and 0.6 is determined by the electronic states at the Fermi level.