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

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dc.citation.firstpage24510
dc.citation.issueNumber2
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber91
dc.contributor.authorAbdel-Hafiez, Mahmoud
dc.contributor.authorZhang, Yuanyuan
dc.contributor.authorHe, Zheng
dc.contributor.authorZhao, Jun
dc.contributor.authorBergmann, Christoph
dc.contributor.authorKrellner, Cornelius
dc.contributor.authorDuan, Chun-Gang
dc.contributor.authorLu, Xingye
dc.contributor.authorLuo, Huiqian
dc.contributor.authorDai, Pengcheng
dc.contributor.authorChen, Xiao-Jia
dc.date.accessioned2016-06-23T16:02:12Z
dc.date.available2016-06-23T16:02:12Z
dc.date.issued2015
dc.description.abstractThe 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.
dc.identifier.citationAbdel-Hafiez, Mahmoud, Zhang, Yuanyuan, He, Zheng, et al.. "Nodeless superconductivity in the presence of spin-density wave in pnictide superconductors: The case of BaFe2−xNixAs2." <i>Physical Review B,</i> 91, no. 2 (2015) American Physical Society: 024510. http://dx.doi.org/10.1103/PhysRevB.91.024510.
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.91.024510
dc.identifier.urihttps://hdl.handle.net/1911/90549
dc.language.isoeng
dc.publisherAmerican Physical Society
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.titleNodeless superconductivity in the presence of spin-density wave in pnictide superconductors: The case of BaFe2−xNixAs2
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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