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

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dc.citation.firstpage24510en_US
dc.citation.issueNumber2en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber91en_US
dc.contributor.authorAbdel-Hafiez, Mahmouden_US
dc.contributor.authorZhang, Yuanyuanen_US
dc.contributor.authorHe, Zhengen_US
dc.contributor.authorZhao, Junen_US
dc.contributor.authorBergmann, Christophen_US
dc.contributor.authorKrellner, Corneliusen_US
dc.contributor.authorDuan, Chun-Gangen_US
dc.contributor.authorLu, Xingyeen_US
dc.contributor.authorLuo, Huiqianen_US
dc.contributor.authorDai, Pengchengen_US
dc.contributor.authorChen, Xiao-Jiaen_US
dc.date.accessioned2016-06-23T16:02:12Zen_US
dc.date.available2016-06-23T16:02:12Zen_US
dc.date.issued2015en_US
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.en_US
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.en_US
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.91.024510en_US
dc.identifier.urihttps://hdl.handle.net/1911/90549en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
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.en_US
dc.titleNodeless superconductivity in the presence of spin-density wave in pnictide superconductors: The case of BaFe2−xNixAs2en_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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