Echo of the Quantum Phase Transition of CeCu6 xAux in XPS: Breakdown of Kondo Screening

@inproceedings{Klein2009EchoOT,
  title={Echo of the Quantum Phase Transition of CeCu6 xAux in XPS: Breakdown of Kondo Screening},
  author={Michael W. Klein and Johann Kroha and Hilbert von L{\"o}hneysen and Oliver Stockert and Friedrich Reinert},
  year={2009}
}
We present an x-ray photoemission study of the heavy fermion system ${\text{CeCu}}_{6\ensuremath{-}x}{\text{Au}}_{x}$ across the magnetic quantum phase transition of this compound at temperatures above the single-ion Kondo temperature ${T}_{K}$. In dependence of the Au concentration $x$ we observe a sudden change in the $f$-occupation number ${n}_{f}$ and the core-hole potential ${U}_{df}$ at the critical concentration ${x}_{c}=0.1$. We interpret these findings in the framework of the single… CONTINUE READING

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