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  Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu2Si2

Yamashita, T., Takenaka, T., Tokiwa, Y., Wilcox, J. A., Mizukami, Y., Terazawa, D., et al. (2017). Fully gapped superconductivity with no sign change in the prototypical heavy-fermion CeCu2Si2. Science Advances, 3(6): e1601667, pp. 1-7. doi:10.1126/sciadv.1601667.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-DF06-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-1236-D
Genre: Journal Article

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Yamashita, Takuya1, Author
Takenaka, Takaaki1, Author
Tokiwa, Yoshifumi1, Author
Wilcox, Joseph A.1, Author
Mizukami, Yuta1, Author
Terazawa, Daiki1, Author
Kasahara, Yuichi1, Author
Kittaka, Shunichiro1, Author
Sakakibara, Toshiro1, Author
Konczykowski, Marcin1, Author
Seiro, Silvia2, Author              
Jeevan, Hirale S.3, Author              
Geibel, Christoph4, Author              
Putzke, Carsten1, Author
Onishi, Takafumi1, Author
Ikeda, Hiroaki1, Author
Carrington, Antony1, Author
Shibauchi, Takasada1, Author
Matsuda, Yuji1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Silvia Seiro, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863473              
3Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
4Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              

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 Abstract: In exotic superconductors, including high-T-c copper oxides, the interactions mediating electron Cooper pairing are widely considered to have a magnetic rather than a conventional electron-phonon origin. Interest in this exotic pairing was initiated by the 1979 discovery of heavy-fermion superconductivity in CeCu2Si2, which exhibits strong antiferromagnetic fluctuations. A hallmark of unconventional pairing by anisotropic repulsive interactions is that the superconducting energy gap changes sign as a function of the electron momentum, often leading to nodes where the gap goes to zero. We report low-temperature specific heat, thermal conductivity, and magnetic penetration depth measurements in CeCu2Si2, demonstrating the absence of gap nodes at any point on the Fermi surface. Moreover, electron irradiation experiments reveal that the superconductivity survives even when the electron mean free path becomes substantially shorter than the superconducting coherence length. This indicates that superconductivity is robust against impurities, implying that there is no sign change in the gap function. These results show that, contrary to long-standing belief, heavy electrons with extremely strong Coulomb repulsions can condense into a fully gapped s-wave superconducting state, which has an on-site attractive pairing interaction.

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Language(s): eng - English
 Dates: 2017-06-232017-06-23
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: -
 Identifiers: ISI: 000406370700003
DOI: 10.1126/sciadv.1601667
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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 3 (6) Sequence Number: e1601667 Start / End Page: 1 - 7 Identifier: Other: 2375-2548
CoNE: /journals/resource/2375-2548