Nematic Quantum Critical Fluctuations in BaFe2−xNixAs2

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dc.citation.articleNumber157002
dc.citation.issueNumber15
dc.citation.journalTitlePhysical Review Letters
dc.citation.volumeNumber117
dc.contributor.authorLiu, Zhaoyu
dc.contributor.authorGu, Yanhong
dc.contributor.authorZhang, Wei
dc.contributor.authorGong, Dongliang
dc.contributor.authorZhang, Wenliang
dc.contributor.authorXie, Tao
dc.contributor.authorLu, Xingye
dc.contributor.authorMa, Xiaoyan
dc.contributor.authorZhang, Xiaotian
dc.contributor.authorZhang, Rui
dc.contributor.authorZhu, Jun
dc.contributor.authorRen, Cong
dc.contributor.authorShan, Lei
dc.contributor.authorQiu, Xianggang
dc.contributor.authorDai, Pengcheng
dc.contributor.authorYang, Yi-feng
dc.contributor.authorLuo, Huiqian
dc.contributor.authorLi, Shiliang
dc.date.accessioned2017-01-27T22:23:42Z
dc.date.available2017-01-27T22:23:42Z
dc.date.issued2016
dc.description.abstractWe have systematically studied the nematic fluctuations in the electron-doped iron-based superconductor BaFe2−xNixAs2 by measuring the in-plane resistance change under uniaxial pressure. While the nematic quantum critical point can be identified through the measurements along the (110) direction, as studied previously, quantum and thermal critical fluctuations cannot be distinguished due to similar Curie-Weiss-like behaviors. Here we find that a sizable pressure-dependent resistivity along the (100) direction is present in all doping levels, which is against the simple picture of an Ising-type nematic model. The signal along the (100) direction becomes maximum at optimal doping, suggesting that it is associated with nematic quantum critical fluctuations. Our results indicate that thermal fluctuations from striped antiferromagnetic order dominate the underdoped regime along the (110) direction. We argue that either there is a strong coupling between the quantum critical fluctuations and the fermions, or more exotically, a higher symmetry may be present around optimal doping.
dc.identifier.citationLiu, Zhaoyu, Gu, Yanhong, Zhang, Wei, et al.. "Nematic Quantum Critical Fluctuations in BaFe2−xNixAs2." <i>Physical Review Letters,</i> 117, no. 15 (2016) American Physical Society: http://dx.doi.org/10.1103/PhysRevLett.117.157002.
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevLett.117.157002
dc.identifier.urihttps://hdl.handle.net/1911/93794
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.titleNematic Quantum Critical Fluctuations in BaFe2−xNixAs2
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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