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Photoemission in YbCu2Si2: problems with the Kondo impurity model

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https://doi.org/10.1016/0304-8853(92)91417-rCreative Commons 'BY' version 4.0 license
Abstract

We report valence band photoemission results for YbCu2Si2, The 4f13(J = 7 2) final state peak, centered 60 meV below the Fermi level ε{lunate}F, lacks the temperature dependence and is broader than predicted for a Kondo resonance. Together with recent photoemission results for cerium compounds, these results raise serious doubts about the Kondo impurity explanation of heavy fermion photoemission. © 1992.

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