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  Full-Gap Superconductivity Robust against Disorder in Heavy-Fermion CeCu2Si2

Takenaka, T., Mizukami, Y., Wilcox, J. A., Konczykowski, M., Seiro, S., Geibel, C., et al. (2017). Full-Gap Superconductivity Robust against Disorder in Heavy-Fermion CeCu2Si2. Physical Review Letters, 119(7): 077001, pp. 1-5. doi:10.1103/PhysRevLett.119.077001.

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 Creators:
Takenaka, T.1, Author
Mizukami, Y.1, Author
Wilcox, J. A.1, Author
Konczykowski, M.1, Author
Seiro, S.1, Author
Geibel, C.2, Author           
Tokiwa, Y.1, Author
Kasahara, Y.1, Author
Putzke, C.1, Author
Matsuda, Y.1, Author
Carrington, A.1, Author
Shibauchi, T.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: A key aspect of unconventional pairing by the antiferromagnetic spin-fluctuation mechanism is that the superconducting energy gap must have the opposite sign on different parts of the Fermi surface. Recent observations of non-nodal gap structure in the heavy-fermion superconductor CeCu2Si2 were then very surprising, given that this material has long been considered a prototypical example of a superconductor where the Cooper pairing is magnetically mediated. Here we present a study of the effect of controlled point defects, introduced by electron irradiation, on the temperature-dependent magnetic penetration depth. lambda (T) in CeCu2Si2. We find that the fully gapped state is robust against disorder, demonstrating that low-energy bound states, expected for sign-changing gap structures, are not induced by nonmagnetic impurities. This provides bulk evidence for s(||)-wave superconductivity without sign reversal.

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Language(s): eng - English
 Dates: 2017-08-182017-08-18
 Publication Status: Issued
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 Table of Contents: -
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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: 119 (7) Sequence Number: 077001 Start / End Page: 1 - 5 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1