The results of the electronic structure calculations and the optical properties study of antiferromagnetic compounds GdSb and TbSb are presented. In the spectral range 0.078 – 5.6 eV, the energy dependences of the real and imaginary parts of the complex dielectric permittivity are investigated by ellipsometric method. The anomalous behavior of spectral characteristics in the infrared region is associated with the semi-metallic properties of these materials. Based on the performed calculations of the band structure, the energy dependences of the interband optical conductivity spectra are discussed.
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