Abstract
Optical properties of DO 3-ordered Fe 3Co and Co 3Fe compounds were investigated by spectroscopic ellipsometry in the 1.5–5.2 eV photon energy region. A broad interband absorption structure exists around 2 eV in the optical conductivity spectra of the compounds. The absorption structure of Co 3Fe is located at lower energies than that of Fe 3Co by about 0.5 eV. The calculated spin-polarized band structures of the compounds by the linear-muffin-tin orbitals method revealed that the Fe- and Co-like d states disperse in the same energy region because of hybridization. The theoretically calculated optical absorption structure of Fe 3Co shows a good agreement with the experimental result while that of Co 3Fe is located at higher energies than the experimental result by about 0.3 eV. Such discrepancy is interpreted as due to the self-energy shift of the interband transitions involving correlated Co-like d electrons.
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