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[en] The Mn X-ray emission spectra and X-ray photoelectron spectra of Mn-based Heusler alloys Co₂MnAl, Co₂MnSb and La_1-xSm_xMn₂Si₂ rare-earth compounds (x=0, 0.8) have been measured and discussed in connection with a value of the local magnetic moment at Mn site. The spectra peculiarities reflect also the localization degree of 3d valence electrons of 3d metals in the considered compounds and could be used as an indicator of the closeness of the density of states to half-metallic character

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[en] There has been considerable interest in high-k-dielectrics rare earth oxides as replacement for SiO₂ in advanced field-effect transistors (FETs). Promising candidates are the perovskites SmScO₃, GdScO₃ and DyScO₃. A tendency towards antiferromagnetic ordering at low temperatures is observed for the high magnetic moments at rare earth atoms. We analyse the electronic structure of the single crystalline samples by means of X-ray photoelectron spectroscopy and firstprinciples theory. The electronic structure calculations are performed with the augmented plane waves method (WIEN2k code) of the density functional theory, taking into account the spin-orbit interaction and orbital-dependent potential (LDA+U). The calculated positions of the main features in the valence band agree with the XPS data, the underlying chemical bonding can be analysed in detail. Small differences in the electronic structure, resulting in different stability of ferro and antiferromagnetic configurations, are discussed

[en] The electronic structures of SmScO₃, GdScO₃, and DyScO₃ are investigated by means of x-ray photoelectron spectroscopy, x-ray emission spectroscopy (XES), and x-ray absorption spectroscopy (XAS). A strong hybridization between Sc 3d and O 2p is found, and a contribution of the rare-earth 5d states to this hybridization is not excluded. The band gaps of the compounds are determined by combining XES and XAS measurements. For SmScO₃, GdScO₃, and DyScO₃ the band gaps were determined to be 5.6, 5.8, and 5.9 eV, respectively. Magnetization versus temperature measurements reveal antiferromagnetic coupling at 2.96 (SmScO₃), 2.61 (GdScO₃), and 3.10 K (DyScO₃). For DyScO₃ a Rietveld refinement of a 2 K neutron-diffraction data set gives the spin arrangement of Dy in the Pbnm structure (Shubnikov group: Pb^'n^'m^')