Abstract
We present a high-resolution photoemission (PES) and temperature-dependent inverse photoemission (BIS) investigation of Ce compounds, and in particular, of the paradigmatic system CeSi x . The PES intensity near the Fermi level follows, the predicted collapse of the Kondo resonance reflects the breakdown of the singlet ground state above T K . These results as in the calculated spectral function of the Anderson Hamiltonian, the evolution of the Kondo temperature T K . In BIS, provide an important confirmation of the validity of the Kondo model of cerium compounds, and contradict recent claims of inconsistencies with spectroscopic data.
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