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  Nodeless superconductivity in the presence of spin-density wave in pnictide superconductors: The case of BaFe2-xNixAs2

Abdel-Hafiez, M., Zhang, Y., He, Z., Zhao, J., Bergmann, C., Krellner, C., et al. (2015). Nodeless superconductivity in the presence of spin-density wave in pnictide superconductors: The case of BaFe2-xNixAs2. Physical Review B, 91(2): 024510, pp. 1-10. doi:10.1103/PhysRevB.91.024510.

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Abdel-Hafiez, Mahmoud1, Author
Zhang, Yuanyuan1, Author
He, Zheng1, Author
Zhao, Jun1, Author
Bergmann, Christoph2, Author              
Krellner, Cornelius1, Author
Duan, Chun-Gang1, Author
Lu, Xingye1, Author
Luo, Huiqian1, Author
Dai, Pengcheng1, Author
Chen, Xiao-Jia1, Author
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1External Organizations, ou_persistent22              
2Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              

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 Abstract: The characteristics of Fe-based superconductors are manifested in their electronic, magnetic properties, and pairing symmetry of the Cooper pair, but the latter remain to be explored. Usually in these materials, superconductivity coexists and competes with magnetic order, giving unconventional pairing mechanisms. We report on the results of the bulk magnetization measurements in the superconducting state and the low-temperature specific heat down to 0.4 K for BaFe2-xNixAs2 single crystals. The electronic specific heat displays a pronounced anomaly at the superconducting transition temperature and a small residual part at low temperatures in the superconducting state. The normal-state Sommerfeld coefficient increases with Ni doping for x = 0.092, 0.096, and 0.10, which illustrates the competition between magnetism and superconductivity. Our analysis of the temperature dependence of the superconducting-state specific heat and the London penetration depth provides strong evidence for a two-band s-wave order parameter. Further, the data of the London penetration depth calculated from the lower critical field follow an exponential temperature dependence, characteristic of a fully gapped superconductor. These observations clearly show that the superconducting gap in the nearly optimally doped compounds is nodeless.

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 Dates: 2015-01-20
 Publication Status: Published in print
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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: 91 (2) Sequence Number: 024510 Start / End Page: 1 - 10 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008