A Mott insulator continuously connected to iron pnictide superconductors

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dc.citation.articleNumber13879
dc.citation.journalTitleNature Communications
dc.citation.volumeNumber7
dc.contributor.authorSong, Yu
dc.contributor.authorYamani, Zahra
dc.contributor.authorCao, Chongde
dc.contributor.authorLi, Yu
dc.contributor.authorZhang, Chenglin
dc.contributor.authorChen, Justin S.
dc.contributor.authorHuang, Qingzhen
dc.contributor.authorWu, Hui
dc.contributor.authorTao, Jing
dc.contributor.authorZhu, Yimei
dc.contributor.authorTian, Wei
dc.contributor.authorChi, Songxue
dc.contributor.authorCao, Huibo
dc.contributor.authorHuang, Yao-Bo
dc.contributor.authorDantz, Marcus
dc.contributor.authorSchmitt, Thorsten
dc.contributor.authorYu, Rong
dc.contributor.authorNevidomskyy, Andriy H.
dc.contributor.authorMorosan, Emilia
dc.contributor.authorSi, Qimiao
dc.contributor.authorDai, Pengcheng
dc.contributor.orgRice Center for Quantum Materials
dc.date.accessioned2017-01-09T18:24:39Z
dc.date.available2017-01-09T18:24:39Z
dc.date.issued2016
dc.descriptionNEWS COVERAGE: A news release based on this journal publication is available online: http://news.rice.edu/2016/12/19/copper-stripes-help-iron-pnictide-lock-in-insulating-state/
dc.description.abstractIron-based superconductivity develops near an antiferromagnetic order and out of a bad-metal normal state, which has been interpreted as originating from a proximate Mott transition. Whether an actual Mott insulator can be realized in the phase diagram of the iron pnictides remains an open question. Here we use transport, transmission electron microscopy, X-ray absorption spectroscopy, resonant inelastic X-ray scattering and neutron scattering to demonstrate that NaFe1−xCuxAs near x≈0.5 exhibits real space Fe and Cu ordering, and are antiferromagnetic insulators with the insulating behaviour persisting above the Néel temperature, indicative of a Mott insulator. On decreasing x from 0.5, the antiferromagnetic-ordered moment continuously decreases, yielding to superconductivity ∼x=0.05. Our discovery of a Mott-insulating state in NaFe1−xCuxAs thus makes it the only known Fe-based material, in which superconductivity can be smoothly connected to the Mott-insulating state, highlighting the important role of electron correlations in the high-Tc superconductivity.
dc.identifier.citationSong, Yu, Yamani, Zahra, Cao, Chongde, et al.. "A Mott insulator continuously connected to iron pnictide superconductors." <i>Nature Communications,</i> 7, (2016) Springer Nature: http://dx.doi.org/10.1038/ncomms13879.
dc.identifier.doihttp://dx.doi.org/10.1038/ncomms13879
dc.identifier.urihttps://hdl.handle.net/1911/93742
dc.language.isoeng
dc.publisherSpringer Nature
dc.rightsThis work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. 
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleA Mott insulator continuously connected to iron pnictide superconductors
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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