3d core-level x-ray photoelectron spectrum (XPS) of Eu in EuCu2Siz exhibits two sets of simple spin-orbit split structures. We have assigned these structures to two different valence states of Eu (Eu + and Eu +) in EuCu2Si2. The relative intensities of 2+ and 3+ peaks are strong functions of temperature. XPS in the 3d region of Eu has been employed for the first time to study the phenomenon of valence fluctuation. The relative advantage of 3d core-level spectroscopy of Eu over 4d and 4f spectral studies is brought out.
ESCA (or XPS) studies of some rare-earth intermetallics were carried out using ESCA (3) Mark II and 'ESCALAB' machines from V G Scientific. The mixed valence nature of EuCu2Si2 and EuNi2P2 intermetallic compounds has been established. The 3d core-level photoemission spectra of Eu in EuCu2Si2 and EuNi2P2 exhibit two sets of structures corresponding to two different valence states of the rare-earth ions. Each of these sets shows simple spin-orbit splitting. The replicate splitting measured by us agrees well with those calculated by Herbst and Wilkins. The 3d core-level photoemission spectra of Eu is free from the multiplet splitting and satellite structure. The importance of 3d core-level photoemission studies in the understanding of valence fluctuation phenomenon has been emphasized.
We report here the results of our X-ray absorption studies (XAS) of RM%Si2 (R = La to Gd) intermetallic compounds. The experimental set-up and the method of preparation of the samples were the s a m e as discussed elsewhere /1 to 3/.
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