Temperature Dependence of the Kondo Resonance and Its Satellites in CeCu{sub 2}Si{sub 2}

We present high-resolution photoemission spectroscopy studies on the Kondo resonance of the strongly correlated Ce system CeCu{sub 2}Si {sub 2} . By exploiting the thermal broadening of the Fermi edge we analyze position, spectral weight, and temperature dependence of the low-energy 4f spectral feat...

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Bibliographic Details
Published in:Physical review letters 2001-09, Vol.87 (10)
Main Authors: Reinert, F., Ehm, D., Schmidt, S., Nicolay, G., Huefner, S., Kroha, J., Trovarelli, O., Geibel, C.
Format: Article
Language:English
Subjects:
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
CRYSTAL FIELD
FERMI LEVEL
PHOTOEMISSION
PHYSICS
RESONANCE
SATELLITES
SPECTROSCOPY
TEMPERATURE DEPENDENCE
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Summary:We present high-resolution photoemission spectroscopy studies on the Kondo resonance of the strongly correlated Ce system CeCu{sub 2}Si {sub 2} . 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 E{sub F} . 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 CeCu{sub 2}Si {sub 2} can be described by single-impurity Kondo physics down to T{approx}5 K .
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.87.106401