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Dallera C, Grioni M, Shukla A, et al. New spectroscopy solves an old puzzle: the Kondo scale in heavy fermions. Phys Rev Lett. 2002;88(19):196403doi: 10.1103/PhysRevLett.88.196403.
Dallera, C., Grioni, M., Shukla, A., Vankó, G., Sarrao, J. L., Rueff, J. P., & Cox, D. L. (2002). New spectroscopy solves an old puzzle: the Kondo scale in heavy fermions. Physical review letters, 88(19), 196403. https://doi.org/10.1103/PhysRevLett.88.196403
Dallera, C, et al. "New spectroscopy solves an old puzzle: the Kondo scale in heavy fermions." Physical review letters vol. 88,19 (2002): 196403. doi: https://doi.org/10.1103/PhysRevLett.88.196403
Dallera C, Grioni M, Shukla A, Vankó G, Sarrao JL, Rueff JP, Cox DL. New spectroscopy solves an old puzzle: the Kondo scale in heavy fermions. Phys Rev Lett. 2002 May 13;88(19):196403. doi: 10.1103/PhysRevLett.88.196403. Epub 2002 Apr 26. PMID: 12005653.
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Phys Rev Lett. 2002 May 13;88(19):196403. doi: 10.1103/PhysRevLett.88.196403. Epub 2002 Apr 26.

New spectroscopy solves an old puzzle: the Kondo scale in heavy fermions.

Physical review letters

C Dallera, M Grioni, A Shukla, G Vankó, J L Sarrao, J P Rueff, D L Cox

Affiliations

  1. INFM-Dipartimento di Fisica, Politecnico di Milano, Piazza Leonardo da Vinci 32, I-20133 Milano, Italy.

PMID: 12005653 DOI: 10.1103/PhysRevLett.88.196403

Abstract

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.

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