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  Thermopower Evolution in Yb(Rh1-xCox)2Si2 Upon 4f Localization

Stockert, U., Klingner, C., Krellner, C., Zlatic, V., Geibel, C., & Steglich, F. (2019). Thermopower Evolution in Yb(Rh1-xCox)2Si2 Upon 4f Localization. Journal of Low Temperature Physics, 196(3-4), 364-374. doi:10.1007/s10909-019-02187-6.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-780C-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-780F-6
Genre: Journal Article

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 Creators:
Stockert, U.1, Author              
Klingner, C.1, Author              
Krellner, C.2, Author
Zlatic, V.2, Author
Geibel, C.3, Author              
Steglich, F.4, Author              
Affiliations:
1Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
2External Organizations, ou_persistent22              
3Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
4Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: We present thermopower measurements on Yb(Rh1-xCox)2Si2. Upon cobalt substitution, the Kondo temperature is decreasing and the single large thermopower minimum observed for YbRh2Si2 splits into two minima. Simultaneously, the absolute thermopower values are strongly reduced due to a weaker exchange coupling between the 4f and the conduction electron states with increasing x. Pure YbCo2Si2 is considered a stable trivalent system. Nevertheless, we still observe two minima in the thermopower indicative of weak residual Kondo scattering. This is in line with results from photoemission spectroscopy revealing a tiny contribution from Yb2+. The value at the high-T minimum in S(T) is found to be proportional to the Sommerfeld coefficient for the whole series. This unexpected finding is discussed in relation to recent measurements of the valence and Fermi surface evolution with temperature.

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Language(s): eng - English
 Dates: 2019-04-092019-04-09
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
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Title: Journal of Low Temperature Physics
Source Genre: Journal
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Publ. Info: New York : Plenum Press.
Pages: - Volume / Issue: 196 (3-4) Sequence Number: - Start / End Page: 364 - 374 Identifier: ISSN: 0022-2291
CoNE: https://pure.mpg.de/cone/journals/resource/954925414929