Temperature dependence of the Kondo resonance and its satellites in CeCu_2Si_2

Abstract

We present high-resolution photoemission spectroscopy studies on the Kondo resonance of the strongly-correlated Ce system CeCu${}_2$Si${}_2$. Exploiting the thermal broadening of the Fermi edge we analyze position, spectral weight, and temperature dependence of the low-energy 4f spectral features, whose major weight lies above the Fermi level $E_F$. We also present theoretical predictions based on the single-impurity Anderson model using an extended non-crossing approximation (NCA), including all spin-orbit and crystal field splittings of the 4f states. The excellent agreement between theory and experiment provides strong evidence that the spectral properties of CeCu${}_2$Si${}_2$ can be described by single-impurity Kondo physics down to $T\approx 5$ K.

arXiv comment4 pages, 3 figures

References in corpus (2)

• Theory of the Fano Resonance in the STM Tunneling Density of States due to a Single Kondo Impurity
• Spectral Properties of the Anderson Impurity Model, Comparison of Numerical Renormalization Group and Non--Crossing Approximation

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