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  Optical evidence of local and itinerant states in Ce- and Yb-heavy-fermion compounds

Kimura, S.-i., Kwon, Y. S., Krellner, C., & Sichelschmidt, J. (2021). Optical evidence of local and itinerant states in Ce- and Yb-heavy-fermion compounds. Electronic Structure, 3(2): 024007, pp. 1-8. doi:10.1088/2516-1075/abffe2.

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Kimura, Shin-ichi1, Author
Kwon, Yong Seung1, Author
Krellner, Cornelius1, Author
Sichelschmidt, Jörg2, Author              
Affiliations:
1External Organizations, ou_persistent22              
2Jörg Sichelschmidt, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863468              

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 Abstract: The electronic properties of Cerium (Ce) and ytterbium (Yb) intermetallic compounds may display a more local or more itinerant character depending on the interplay of the exchange interactions among the 4f electrons and the Kondo coupling between 4f and conduction electrons. For the more itinerant case, the materials form heavy-fermions once the Kondo effect is developed at low temperatures. Hence, a temperature variation occurs in the electronic structure that can be traced by investigating the optical conductivity (σ(ω)) spectra. Remarkably, the temperature variation in the σ(ω) spectrum is still present in the more localized case, even though the Kondo effect is strongly suppressed. Here, we clarify the local and itinerant character in the electronic structure by investigating the temperature dependence in the σ(ω) spectra of various Ce and Yb compounds with a tetragonal ThCr2Si2-type crystal structure. We explain the temperature change in a unified manner. Above temperatures of about 100 K, the temperature dependence of the σ(ω) spectra is mainly due to the electron–phonon interaction, while the temperature dependence below is due to the Kondo effect.

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Language(s): eng - English
 Dates: 2021-06-162021-06-16
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: DOI: 10.1088/2516-1075/abffe2
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Title: Electronic Structure
Source Genre: Journal
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Publ. Info: Bristol : IOP Publishing
Pages: - Volume / Issue: 3 (2) Sequence Number: 024007 Start / End Page: 1 - 8 Identifier: ISSN: 2516-1075
CoNE: https://pure.mpg.de/cone/journals/resource/2516-1075