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research article
New spectroscopy solves an old puzzle: The Kondo scale in heavy fermions
Resonant inelastic x-ray scattering (RIXS) yields clear evidence of spectroscopic Kondo scales in heavy fermions. In YbInCu4 and YbAgCu4 RIXS probes the Yb2+ component of the hybrid ground state and the temperature dependence of the Yb 4f occupation. We report a sudden valence change at a phase transition in YbInCu4 , but a continuous temperature dependence in YbAgCu4 , consistent with the predictions of the Anderson impurity model, for a Kondo temperature T-K=70 K . These results solve a long-standing controversy and establish RIXS as a quantitative probe of the electronic structure of strongly correlated electron systems.
Type
research article
Web of Science ID
WOS:000175324900036
Authors
Publication date
2002
Publisher
Published in
Volume
88
Article Number
196403
Peer reviewed
REVIEWED
EPFL units
Available on Infoscience
April 7, 2010
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