Temperature-invariant photoelectron spectra in cerium heavy-fermion compounds : inconsistencies with the Kondo model

4f levels in Ce heavy-fermion compounds (CeSi sub 2 , CeBe sub 13 , CeSb sub 2 , CeAl sub 3 ) are examined using resonant photoemission. The following inconsistencies with the predictions of the Kondo model were found: all temperature dependence can be accounted for simply by phonon broadening and t...

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