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Optical spectroscopy of ScNiSb and YNiSb intermetallic compounds
Russian version
Knyazev Yu. I. 1, Kuz'min Yu. I. 1
1M.N. Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences, Yekaterinburg, Russia
Email: knyazev@imp.uran.ru, yukuzmin@imp.uran.ru
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Experimental studies of the optical and dielectric properties of intermetallic half-Heusler compounds ScNiSb and YNiSb have been performed. The frequency dependences of optical constants - refractive indices and absorption coefficients, were measured using an ellipsometric method in the energy range of 0.08-5.64 eV. Using these parameters, the spectra of the real and imaginary parts of the complex permittivity, optical conductivity, reflectivity, and the function of characteristic electron energy losses are calculated. Based on a comparative analysis of experimental and theoretical optical conductivity spectra, the nature of interband light absorption in both materials is discussed. The semi-metallic properties of the compounds are manifested in the anomalous behavior of spectral characteristics in the infrared region of the spectrum. Keywords: intermetallic compounds, optical properties, permittivity, optical conductivity, electronic structure.
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