XPS中CeCu $_{6-x}$ Au $_x$量子相变的回声：近藤屏蔽的破坏
Echo of the Quantum Phase Transition of CeCu$_{6-x}$Au$_x$ in XPS: Breakdown of Kondo Screening
摘要：
我们提出了一个X射线光电子能谱研究的重费米子系统CeCu $_{6-x}$金$_x$在磁量子相变的这种化合物在温度高于单离子近藤温度$T_K$。在依赖的Au浓度$x$，我们观察到的$f$ -占据数$n_f$和核心空穴电位$U_{df}$的突变在临界浓度$x_c=0.1$。我们解释这些发现的框架中的单杂质安德森模型。我们的研究结果是在很好的协议，从早期的UPS测量% \cite{klein08qpt}的结果，并提供进一步的信息，在高温下的量子临界的前体。
英文摘要：
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.
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