Temperature dependence of the Kondo resonance and its satellites in CeCu_2Si_2

Details Temperature dependence of the Kondo resonance and its satellites in CeCu_2Si_2 Temperature dependence of the Kondo resonance and its satellites in CeCu_2Si_2

2001-04-02

arxiv.org/abs/cond-mat/0104037v1

Phys. Rev. Lett. 87, 106401 (2001).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.87.106401

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.

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