In this study, the ab initio and experimental results for RCuGe ternary intermetallics were reported for R = Tb, Dy, Ho, Er. Our theoretical calculations of the electronic structure, employing local spin density approximation accounting for electron–electron correlations in the 4f shell of Tb, Dy, Ho, Er ions were carried in DFT+U method. The optical properties of the RCuGe ternary compounds were studied at a broad range of wavelengths. The spectral and electronic characteristics were obtained. The theoretical electron densities of states were taken to interpret the experimental energy dependencies of the experimental optical conductivity in the interband light–absorption region. From the band calculations, the 4f shell of the rare-earth ions was shown to provide the major contribution to the electronic structure, magnetic and optical properties of the RCuGe intermetallics. The accounting for electron–electron correlations in Tb, Dy, Ho, Er resulted in a good agreement between the calculated and experimental magnetic and optical characteristics.

In this work, the validity of standard magnetocaloric (MCE) scenarios is revisited for the Hubbard model for a square (two-dimensional) lattice to describe a layered metal. Different types of magnetic...

In this paper, the electronic structure and magnetic properties of the ternary intermetallics of the HoNiZ series (Z = Ga, Si, Al) is studied using the LSDA+U first-principles method. An analysis of the densities of electronic states in the compounds HoNiGa, HoNiSi, and HoNiAl with accounting for electronic correlations is performed.

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