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  Distinct Kondo Screening Behaviors in Heavy Fermion Filled Skutterudites with 4f1 and 4f2 Configurations

Lou, X., Yu, T. L., Song, Y. H., Wen, C. H. P., Wei, W. Z., Leithe-Jasper, A., et al. (2021). Distinct Kondo Screening Behaviors in Heavy Fermion Filled Skutterudites with 4f1 and 4f2 Configurations. Physical Review Letters, 126(13): 136402, pp. 1-7. doi:10.1103/PhysRevLett.126.136402.

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 Creators:
Lou, X.1, Author
Yu, T. L.1, Author
Song, Y. H.1, Author
Wen, C. H. P.1, Author
Wei, W. Z.1, Author
Leithe-Jasper, A.2, Author              
Ding, Z. F.1, Author
Shu, L.1, Author
Kirchner, S.1, Author
Xu , H. C.1, Author
Peng, R.1, Author
Feng , D. L.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863406              

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Free keywords: Electric fields, Electrons, Excited states, Ground state, Incoherent scattering, Photoelectron spectroscopy, Rare earths, Angle resolved photoemission spectroscopy, Conduction electrons, Crystalline electric fields, Filled skutterudites, Heavy fermion systems, Heavy-fermion superconductivity, Hybridization gap, Representative compound, Antimony compounds
 Abstract: CeOs4Sb12 (COS) and PrOs4Sb12 (POS) are two representative compounds that provide the ideal vantage point to systematically study the physics of multi-f-electron systems. COS with Ce 4f1, and POS with Pr 4f2 configurations show distinct properties of Kondo insulating and heavy fermion superconductivity, respectively. We unveiled the underlying microscopic origin by angle-resolved photoemission spectroscopy studies. Their eV-scale band structure matches well, representing the common characters of conduction electrons in ROs4Sb12 systems (R=rare earth). However, f electrons interact differently with conduction electrons in COS and POS. Strong hybridization between conduction electrons and f electrons is observed in COS with band dependent hybridization gaps, and the development of a Kondo insulating state is directly revealed. Although the ground state of POS is a singlet, finite but incoherent hybridization exists, which can be explained by the Kondo scattering with the thermally excited triplet crystalline electric field state. Our results help us to understand the intriguing properties in COS and POS, and provide a clean demonstration of the microscopic differences in heavy fermion systems with 4f1 and 4f2 configurations. © 2021 American Physical Society.

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Language(s): eng - English
 Dates: 2021-04-012021-04-01
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevLett.126.136402
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 126 (13) Sequence Number: 136402 Start / End Page: 1 - 7 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1