Echo of the Quantum Phase Transition of CeCu${}_{6-x}$Au${}_x$ in XPS: Breakdown of Kondo Screening

Abstract

We present an X-ray photoemission study of the heavy-fermion system CeCu${}_{6-x}$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 of 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-impurity Anderson model. Our results are in excellent agreement with findings from earlier UPS measurements %\cite{klein08qpt} and provide further information about the precursors of quantum criticality at elevated temperatures.

arXiv comment5 pages, 3 figures; published version, references updated, minor changes in wording

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• Nonlocal Kondo effect and quantum critical phase in heavy fermion metals
• Quantum phase transition in a two-dimensional Kondo-Heisenberg model: a Schwinger-boson large-N approach
• Giant spectral renormalization and complex hybridization physics in a Kondo lattice system, CeCuSb2
• High-temperature signatures of quantum criticality in heavy fermion systems