Semiconductor Physics, Quantum Electronics & Optoelectronics. 2007. V. 10, N 3. P. 058-060.

Optical investigation of the electronic structure of alloys Сu-Fе
V.V. Vovchenko, V.S. Staschuk, L.V. Poperenko, V.O. Lysiuk

Department of Physics, Taras Shevchenko Kyiv National University 2, Academician Glushkov prospect, 03022 Kyiv, Ukraine Phone: +38 (044)5262296; fax: +38 (044)5264507; e-mail:

Abstract. We investigate the optical properties of Cu-Fe alloys in a wide interval of concentrations (7.5–30 at. %) and in a wide spectral interval (0.25–7 µm). An additional absorption associated with interband electron transitions from localized states of impurities to the Fermi level has been revealed in the 0.98–1.9-eV spectral range. The energy bands in Cu-Fe alloys are almost undeformed and similar to copper ones, while the Fe impurity forms localized d-bands at a distance of about 1.0-1.6 eV from the Fermi level. For high impurity concentrations, the experimental optical conductivity spectra σ (hν) of the alloys are determined by a superposition of the spectra of Fe and the appropriate solid solution with the corresponding weight coefficients. The obtained experimental data allow one to calculate the density of states N (Е) which is related to the impurity band.

Keywords: optical conductivity, maximum solubility, Fermi level, density of states.

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