Temperature Dependence of the Kondo Resonance and Its Satellites in CeCu2Si2

F. Reinert, D. Ehm, S. Schmidt, G. Nicolay, S. Hüfner, J. Kroha, O. Trovarelli, and C. Geibel
Phys. Rev. Lett. 87, 106401 – Published 20 August 2001
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Abstract

We present high-resolution photoemission spectroscopy studies on the Kondo resonance of the strongly correlated Ce system CeCu2Si2. By 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 EF. We also present theoretical predictions based on the single-impurity Anderson model using an extended noncrossing approximation, 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 CeCu2Si2 can be described by single-impurity Kondo physics down to T5K.

  • Received 2 April 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.106401

©2001 American Physical Society

Authors & Affiliations

F. Reinert*, D. Ehm, S. Schmidt, G. Nicolay, and S. Hüfner

  • Universität des Saarlandes, Fachrichtung 7.2–Experimentalphysik, 66041 Saarbrücken, Germany

J. Kroha

  • Institut für Theorie der Kondensierten Materie, Universität Karlsruhe, Engesserstrasse 7, 76128 Karlsruhe, Germany

O. Trovarelli and C. Geibel

  • Max-Planck Institute for Chemical Physics of Solids, Nöthnitzer Strasse 40, 01187 Dresden, Germany

  • *Corresponding author.Email address: friedel@mx.uni-saarland.de

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Vol. 87, Iss. 10 — 3 September 2001

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