Correlation-driven metal-insulator transition in proximity to an iron-based superconductor

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dc.citation.articleNumber195121en_US
dc.citation.issueNumber19en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber96en_US
dc.contributor.authorCharnukha, A.en_US
dc.contributor.authorYin, Z.P.en_US
dc.contributor.authorSong, Y.en_US
dc.contributor.authorCao, C.D.en_US
dc.contributor.authorDai, Pengchengen_US
dc.contributor.authorHaule, K.en_US
dc.contributor.authorKotliar, G.en_US
dc.contributor.authorBasov, D.N.en_US
dc.date.accessioned2017-12-21T18:21:52Zen_US
dc.date.available2017-12-21T18:21:52Zen_US
dc.date.issued2017en_US
dc.description.abstractWe report the direct spectroscopic observation of a metal to correlated-insulator transition in the family of iron-based superconducting materials. By means of optical spectroscopy we demonstrate that the excitation spectrum of NaFe1−xCuxAs develops a large gap with increasing copper substitution. Dynamical mean-field theory calculations show a good agreement with the experimental data and suggest that the formation of the charge gap requires an intimate interplay of strong on-site electronic correlations and spin-exchange coupling, revealing the correlated Slater-insulator nature of the antiferromagnetic ground state. Our calculations further predict the high-temperature paramagnetic state of the same compound to be a highly incoherent correlated metal. We verify this prediction experimentally by showing that the doping-induced weakening of antiferromagnetic correlations enables a thermal crossover from an insulating to an incoherent metallic state. Redistribution of the optical spectral weight in this crossover uncovers the characteristic energy of Hund's-coupling and Mott-Hubbard electronic correlations essential for the electronic localization. Our results demonstrate that NaFe1−xCuxAs continuously transitions from the typical itinerant phases of iron pnictides to a highly incoherent metal and ultimately a correlated insulator. Such an electronic state is expected to favor high-temperature superconductivity.en_US
dc.identifier.citationCharnukha, A., Yin, Z.P., Song, Y., et al.. "Correlation-driven metal-insulator transition in proximity to an iron-based superconductor." <i>Physical Review B,</i> 96, no. 19 (2017) American Physical Society: https://doi.org/10.1103/PhysRevB.96.195121.en_US
dc.identifier.digitalPhysRevB-96-195121en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.96.195121en_US
dc.identifier.urihttps://hdl.handle.net/1911/98916en_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.titleCorrelation-driven metal-insulator transition in proximity to an iron-based superconductoren_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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