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  Fully gapped d-wave superconductivity in CeCu2Si2

Pang, G., Smidman, M., Zhang, J., Jiao, L., Weng, Z., Nica, E. M., et al. (2018). Fully gapped d-wave superconductivity in CeCu2Si2. Proceedings of the National Academy of Sciences of the United States of America, 115(21), 5343-5347. doi:10.1073/pnas.1720291115.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0001-5155-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-6E7C-A
Genre: Journal Article

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 Creators:
Pang, Guiming1, Author
Smidman, Michael1, Author
Zhang, Jinglei1, Author
Jiao, Lin1, Author
Weng, Zongfa1, Author
Nica, Emilian M.1, Author
Chen, Ye1, Author
Jiang, Wenbing1, Author
Zhang, Yongjun1, Author
Xie, Wu1, Author
Jeevan, Hirale S.1, Author
Lee, Hanoh1, Author
Gegenwart, Philipp1, Author
Steglich, F.2, Author              
Si, Qimiao1, Author
Yuan, Huiqiu1, 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: Identifying the gap structure of superconductors is vital for understanding the underlying pairing mechanism of the Cooper pairs. The first heavy fermion superconductor to be discovered, CeCu2Si2, was thought to be a d-wave superconductor with gap nodes, until recent specific heat measurements provided evidence that the gap is fully open across the Fermi surface. We propose a resolution to this puzzle from measurements of the London penetration depth, which give further evidence for fully gapped superconductivity. We analyze the data using a d-wave band-mixing pairing model, which leads to a fully open superconducting gap. Our model accounts well for the penetration depth and specific heat data, while reconciling the nodeless and sign-changing nature of the gap function.The nature of the pairing symmetry of the first heavy fermion superconductor CeCu2Si2 has recently become the subject of controversy. While CeCu2Si2 was generally believed to be a d-wave superconductor, recent low-temperature specific heat measurements showed evidence for fully gapped superconductivity, contrary to the nodal behavior inferred from earlier results. Here, we report London penetration depth measurements, which also reveal fully gapped behavior at very low temperatures. To explain these seemingly conflicting results, we propose a fully gapped d+d band-mixing pairing state for CeCu2Si2, which yields very good fits to both the superfluid density and specific heat, as well as accounting for a sign change of the superconducting order parameter, as previously concluded from inelastic neutron scattering results.

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Language(s): eng - English
 Dates: 2018-05-082018-05-08
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1073/pnas.1720291115
BibTex Citekey: Pang201720291
 Degree: -

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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : Proceedings of the National Academy of Sciences of the USA
  Other : Proc. Acad. Sci. USA
  Other : Proc. Acad. Sci. U.S.A.
  Abbreviation : PNAS
Source Genre: Journal
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Publ. Info: Washington, D.C. : National Academy of Sciences
Pages: - Volume / Issue: 115 (21) Sequence Number: - Start / End Page: 5343 - 5347 Identifier: ISSN: 0027-8424
CoNE: /journals/resource/954925427230