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  Similar temperature scale for valence changes in Kondo lattices with different Kondo temperatures

Kummer, K., Geibel, C., Krellner, C., Zwicknagl, G., Laubschat, C., Brookes, N. B., et al. (2018). Similar temperature scale for valence changes in Kondo lattices with different Kondo temperatures. Nature Communications, 9: 2011, pp. 1-7. doi:10.1038/s41467-018-04438-8.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-6590-A Version Permalink: http://hdl.handle.net/21.11116/0000-0001-6595-5
Genre: Journal Article

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 Creators:
Kummer, K.1, Author
Geibel, C.2, Author              
Krellner, C.3, Author              
Zwicknagl, G.1, Author
Laubschat, C.1, Author
Brookes, N. B.1, Author
Vyalikh, D. V.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
3Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              

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 Abstract: The Kondo model predicts that both the valence at low temperatures and its temperature dependence scale with the characteristic energy TK of the Kondo interaction. Here, we study the evolution of the 4f occupancy with temperature in a series of Yb Kondo lattices using resonant X-ray emission spectroscopy. In agreement with simple theoretical models, we observe a scaling between the valence at low temperature and TK obtained from thermodynamic measurements. In contrast, the temperature scale Tv at which the valence increases with temperature is almost the same in all investigated materials while the Kondo temperatures differ by almost four orders of magnitude. This observation is in remarkable contradiction to both naive expectation and precise theoretical predictions of the Kondo model, asking for further theoretical work in order to explain our findings. Our data exclude the presence of a quantum critical valence transition in YbRh2Si2.

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Language(s): eng - English
 Dates: 2018-05-222018-05-22
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1038/s41467-018-04438-8
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Title: Nature Communications
  Abbreviation : Nat. Commun.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: 2011 Volume / Issue: 9 Sequence Number: 2011 Start / End Page: 1 - 7 Identifier: ISSN: 2041-1723
CoNE: /journals/resource/2041-1723