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  Multiband Superconductivity with Unexpected Deficiency of Nodal Quasiparticles in CeCu2Si2

Kittaka, S., Aoki, Y., Shimura, Y., Sakakibara, T., Seiro, S., Geibel, C., et al. (2014). Multiband Superconductivity with Unexpected Deficiency of Nodal Quasiparticles in CeCu2Si2. Physical Review Letters, 112(6): 067002, pp. 1-5. doi:10.1103/PhysRevLett.112.067002.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0017-FD9C-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-0C45-A
Genre: Journal Article

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 Creators:
Kittaka, Shunichiro1, Author
Aoki, Yuya1, Author
Shimura, Yasuyuki1, Author
Sakakibara, Toshiro1, Author
Seiro, Silvia2, Author              
Geibel, Christoph3, Author              
Steglich, Frank4, Author              
Ikeda, Hiroaki1, Author
Machida, Kazushige1, Author
Affiliations:
1external, ou_persistent22              
2Silvia Seiro, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863473              
3Christoph Geibel, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863465              
4Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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 Abstract: Superconductivity in the heavy-fermion compound CeCu2Si2 is a prototypical example of Cooper pairs formed by strongly correlated electrons. For more than 30 years, it has been believed to arise from nodal d-wave pairing mediated by a magnetic glue. Here, we report a detailed study of the specific heat and magnetization at low temperatures for a high-quality single crystal. Unexpectedly, the specific-heat measurements exhibit exponential decay with a two-gap feature in its temperature dependence, along with a linear dependence as a function of magnetic field and the absence of oscillations in the field angle, reminiscent of multiband full-gap superconductivity. In addition, we find anomalous behavior at high fields, attributed to a strong Pauli paramagnetic effect. A low quasiparticle density of states at low energies with a multiband Fermi-surface topology would open a new door into electron pairing in CeCu2Si2.

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Language(s): eng - English
 Dates: 2014-02-14
 Publication Status: Published in print
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Title: Physical Review Letters
  Other : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 112 (6) Sequence Number: 067002 Start / End Page: 1 - 5 Identifier: ISSN: 0031-9007
CoNE: /journals/resource/954925433406_1