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  Absence of magnetic field effect on the cerium valence in CeCu2Si2 at its optimum superconducting critical temperature

Barbier, M., Sundermann, M., Poux, A., Rogalev, A., Braithwaite, D., Sanchez, J.-P., et al. (2021). Absence of magnetic field effect on the cerium valence in CeCu2Si2 at its optimum superconducting critical temperature. Physical Review B, 104(20): 205136, pp. 1-6. doi:10.1103/PhysRevB.104.205136.

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 Creators:
Barbier, M.1, Author
Sundermann, M.2, Author              
Poux, A.1, Author
Rogalev, A.1, Author
Braithwaite, D.1, Author
Sanchez, J.-P.1, Author
Wilhelm, F.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: The archetypical heavy-fermion superconductor CeCu2Si2 is known to present two distinct superconducting phases under pressure. In the low-pressure region, the superconductivity is mediated by spin fluctuations while the superconducting phase observed in the high-pressure region could be associated with a first-order valence transition (FOVT). However, the critical end point (CEP) of the FOVT was shown to be located at negative temperature and only a continuous valence change (crossover regime) was so far observed at 14 K, i.e., far above the optimal superconducting temperature (Tc = 2.3 K). Here we present x-ray absorption measurements under pressure and applied magnetic field at the Ce L3 edge at 2.7 K, i.e., close to the optimal Tc. It was expected that the applied magnetic field could shift the CEP to positive temperature with the possibility to observe a FOVT. Our data indicate the valence of Ce increases continuously (crossover regime) from 3.11 at ambient pressure up to 3.20 at 8.5 GPa likewise for any applied magnetic field up to 6 T.

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Language(s): eng - English
 Dates: 2021-11-292021-11-29
 Publication Status: Published in print
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 Table of Contents: -
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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: 104 (20) Sequence Number: 205136 Start / End Page: 1 - 6 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008