AbslracL The Ni 2p and 0 Is XPS of NiO single crystals were measured using monochromatic Al K a radiation. Different treatmenu of the crystals allow us to give a description of the influence of defects on these spectra. The Ni 2p3p spectrum of in-sirucleaved NiO exibiu clearly visible features at 854.1 eV, 855.6 eV and 861 eV The intensity ratio changes after ion bombardment and an additional peak at 852.2 eV appears. ApaR from a slight increase in linewidth the 0 1s spectrum remains unchanged. The 0 Is spectrum from an in-sirueleaved NiO single crystal exhibits only a single peak at 529.4 eV which can be fitted by a Gaussian line profile. Further measurements allow us to attribute the well known 0 Is satellite at 531.2 eV to emission [ram oxygen-containing species adsorbed at defects.
The results of ab initio band-structure calculations and measurements of x-ray-emission valence spectra ͑XES͒ ͑Cu L␣, V K 5 , V L␣, S K 1,3 , S L 2,3 ) and x-ray-photoelectron valence-band and core-level spectra ͑XPS͒ of CuV 2 S 4 thiospinel are presented. It is found that a peak in valence-conduction bands close to Fermi level is formed by V 3d states, which provide the metallic properties of CuV 2 S 4 . The valence band is formed by Cu 3d, V 3d, V 4p, and S 3p states. Examination of the XES and XPS results and the calculated charge-density maps and densities of states indicates that the valences of both Cu and V are similar to those of their elemental solids. Calculations show a strong electron-phonon coupling in CuV 2 S 4 and the prospect of superconducting behavior has not been confirmed.
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