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Title

Study of 4f hybridization in CeNiX with X=SnδGe1−δ, 0≤δ≤1

AuthorsFuente, Carlos de la ; Moral, A. del; Fraile, José M.
KeywordsPhotoemission and photoelectron spectra
Neutron inelastic scattering
Electron density of states and band structure of crystalline solids
Issue Date2010
PublisherElsevier
CitationJournal of Magnetism and Magnetic Materials 322(9-12): 1059-1063 (2010)
AbstractWe report inelastic neutron scattering and core-level X-ray photoemission spectroscopy experiments for studying the Kondo problem in the CeNiX, X=SnδGe1−δ 0≤δ≤1 series. The neutron results confirm that they behave like a Kondo lattice for δ≥0.85, showing broad maxima at around 30 meV, typical of a crystal field magnetic scattering. So, the Ge doping could produce the suppression of the cerium magnetism observed for δ≤0.25. To open a more deep sight on this point, we have analyzed the 3d core-level XPS spectra by using the well-known Gunnarsson–Schönhammer model. From this analysis, we have obtained the “on-site” Coulomb bare repulsion for f states, U, and hybridization parameter, Δ, related with the hopping from the f states to the conduction ones. These U values are very similar for all compounds, about 7 eV, but the hybridization parameter slightly changes from 0.2 to 0.16 eV on increasing the Sn concentration. In Sn-rich compounds, the 4f occupation is close to spin limit fluctuation, which allows us to obtain an estimation of the Kondo temperatures, ≈1200 K, and the static 0 K susceptibility, ≈1.1×10−3 emu/mol. Finally, we have done “ab-initio” calculations based on the LDA+U+SO which confirm the existence of a small electronic gap opening in the DOS of Ge-rich compounds for U values lower than 7 eV.
Description5 páginas, 4 figuras, 2 tablas.-- et al.
Publisher version (URL)http://dx.doi.org/10.1016/j.jmmm.2009.05.037
URIhttp://hdl.handle.net/10261/43133
DOI10.1016/j.jmmm.2009.05.037
ISSN0304-8853
Appears in Collections:(ICMA) Artículos
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