The effect of Cu-doping on the electronic structure and optical properties of intermetallic compounds (Ho,Er)Ni 5Àx Cu x (x ¼ 0, 1, 2) has been studied. Band structure and interband optical conductivity were investigated theoretically using the LSDA þ U method supplementing local spin density approximation with a correction for strong electron interaction on the 4f shell of rare earth element. Optical properties were studied by the ellipsometry method in the spectral range 0.22-15 mm. It was found that substitution of Cu for Ni atoms in these alloys leads to significant changes in the frequency dependence of the optical conductivity. Both the theoretical calculations and spectroscopic experiments revealed the appearance of a new absorption maximum near 4.5 eV formed by Cu 3d ! Ni 3d interband transitions.
For the alloys Y2Fe17, Y2(Fe0.9M0.1)17, where M = Al and Si, the X‐ray diffraction pictures, magnetic properties, Mössbauer effect at 57Fe nucleus, heat capacity, and optical conductivity were studied. The Curie temperature enhancement of the substitutional alloys Y2(Fe0.9M0.1)17 (M = Al, Si) compared to the Y2Fe17 alloy is explained in terms of the strong decrease in spin‐up density of states at the Fermi level. This is due to valence electrons of the substitution atoms filling the 3d band.
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