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  Revealing the Heavy Quasiparticles in the Heavy-Fermion Superconductor CeCu2Si2

Wu, Z., Fang, Y., Su, H., Xie, W., Li, P., Wu, Y., et al. (2021). Revealing the Heavy Quasiparticles in the Heavy-Fermion Superconductor CeCu2Si2. Physical Review Letters, 127: 067002, pp. 1-6. doi:10.1103/PhysRevLett.127.067002.

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 Creators:
Wu, Zhongzheng1, Author
Fang, Yuan1, Author
Su, Hang1, Author
Xie, Wu1, Author
Li, Peng1, Author
Wu, Yi1, Author
Huang, Yaobo1, Author
Shen, Dawei1, Author
Thiagarajan, Balasubramanian1, Author
Adell, Johan1, Author
Cao, Chao1, Author
Yuan, Huiqiu1, Author
Steglich, Frank2, Author           
Liu, Yang1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: The superconducting order parameter of the first heavy-fermion superconductor CeCu2Si2 is currently under debate. A key ingredient to understand its superconductivity and physical properties is the quasiparticle dispersion and Fermi surface, which remains elusive experimentally. Here, we present measurements from angle-resolved photoemission spectroscopy. Our results emphasize the key role played by the Ce 4f electrons for the low-temperature Fermi surface, highlighting a band-dependent conduction-f electron hybridization. In particular, we find a very heavy quasi-two-dimensional electron band near the bulk X point and moderately heavy three-dimensional hole pockets near the Z point. Comparison with theoretical calculations reveals the strong local correlation in this compound, calling for further theoretical studies. Our results provide the electronic basis to understand the heavy-fermion behavior and superconductivity; implications for the enigmatic super-conductivity of this compound are also discussed.

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Language(s): eng - English
 Dates: 2021-08-022021-08-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevLett.127.067002
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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: 127 Sequence Number: 067002 Start / End Page: 1 - 6 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1