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  Intermediate valence in single crystalline Yb2Si2Al

Gannon, W. J., Chen, K., Sundermann, M., Strigari, F., Utsumi, Y., Tsuei, K.-.-D., et al. (2018). Intermediate valence in single crystalline Yb2Si2Al. Physical Review B, 98(7): 075101, pp. 1-9. doi:10.1103/PhysRevB.98.075101.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-EEEB-B Version Permalink: http://hdl.handle.net/21.11116/0000-0001-EEED-9
Genre: Journal Article

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 Creators:
Gannon, W. J.1, Author
Chen, K.1, Author
Sundermann, M.2, Author              
Strigari, F.1, Author
Utsumi, Y.2, Author              
Tsuei, K. -D.1, Author
Rueff, J. -P.1, Author
Bencok, P.1, Author
Tanaka, A.1, Author
Severing, A.2, Author              
Aronson, M. C.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              

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 Abstract: Yb2Si2Al may be a prototype for exploring different aspects of the Shastry-Sutherland lattice, formed by planes of orthogonally coupled Yb ions. Measurements of the magnetic susceptibility find incoherently fluctuating Yb3+ moments coexisting with a weakly correlated metallic state that is confirmed by measurements of the electrical resistivity. Increasing signs of Kondo coherence are found with decreasing temperature, including an enhanced Sommerfeld coefficient and Kadowaki-Woods ratio that signal that the metallic state found at the lowest temperatures is a Fermi liquid where correlations have become significantly stronger. A pronounced peak in the electronic and magnetic specific heat indicates that the coupling of the Yb moments to the conduction electrons leads to an effective Kondo temperature that is approximately 30 K. The valence of Yb2Si2Al has been investigated with electron spectroscopy methods. Yb2Si2Al is found to be strongly intermediate valent [v(F) = 2.68(2) at 80 K]. Taken together, these experimental data are consistent with a scenario where a coherent Kondo lattice forms in Yb2Si2Al from an incoherently fluctuating ensemble of Yb moments with incomplete Kondo compensation, and strong intermediate valence character.

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Language(s): eng - English
 Dates: 2018-08-012018-08-01
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 98 (7) Sequence Number: 075101 Start / End Page: 1 - 9 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008