Fig. 1: Element-specific X-ray absorption spectroscopy (XAS) and resonant photoemission spectroscopy (ResPES) for the CrMnFeCoNi HEA.
From: Interplay between disorder and electronic correlations in compositionally complex alloys
The figure shows XAS L3-edge spectra (right side of each panel, in white, with intensity in arbitrary units) and corresponding ResPES energy distribution curves (EDCs) for Cr, Mn, Fe, Co, and Ni. The EDCs are plotted on a binding energy (EB) scale, with the photon energy as the vertical axis. The white lines on the ResPES plots indicate the EDC intensities at the XAS L3 maxima, marked by arrows. For Cr, the EDCs exhibit a pronounced peak at a constant EB, indicating the presence of valence band features. In contrast, for Fe, Co, and Ni, the EDCs display maxima at constant kinetic energy, suggesting significant Auger contributions and highlighting the transition from radiationless ResPES (constant EB below XAS maximum) to resonant Auger regimes (constant Ek XAS L3 maximum). The shift of the 6 eV satellite in pure Ni towards higher EB = 7.2 eV in the alloy, may be attributed to the d-band filling after alloying with more electropositive elements.
