Optical investigation of the electronic structure of alloys Сu-Fе

• Veröffentlicht in: Semiconductor Physics Quantum Electronics & Optoelectronics
• Datum: 2007
• Hauptverfasser: Vovchenko, V.V., Staschuk, V.S., Poperenko, L.V., Lysiuk, V.O.
• Format: Artikel
• Sprache: English
• Veröffentlicht: Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України 2007
• Online Zugang: https://nasplib.isofts.kiev.ua/handle/123456789/118123
• Назва журналу: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Zitieren: Optical investigation of the electronic structure of alloys Сu-Fе / V.V. Vovchenko, V.S. Staschuk, L.V. Poperenko, V.O. Lysiuk // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2007. — Т. 10, № 3. — С. 58-60. — Бібліогр.: 5 назв. — англ.

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.