Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s± Pairing

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dc.citation.articleNumber31001en_US
dc.citation.issueNumber3en_US
dc.citation.journalTitlePhysical Review Xen_US
dc.citation.volumeNumber4en_US
dc.contributor.authorZhang, P.en_US
dc.contributor.authorRichard, P.en_US
dc.contributor.authorQian, T.en_US
dc.contributor.authorShi, X.en_US
dc.contributor.authorMa, J.en_US
dc.contributor.authorZeng, L.-K.en_US
dc.contributor.authorWang, X.-P.en_US
dc.contributor.authorRienks, E.en_US
dc.contributor.authorZhang, C.-L.en_US
dc.contributor.authorDai, Pengchengen_US
dc.contributor.authorYou, Y.-Z.en_US
dc.contributor.authorWeng, Z.-Y.en_US
dc.contributor.authorWu, X.-X.en_US
dc.contributor.authorHu, J.P.en_US
dc.contributor.authorDing, H.en_US
dc.date.accessioned2017-08-04T12:29:40Zen_US
dc.date.available2017-08-04T12:29:40Zen_US
dc.date.issued2014en_US
dc.description.abstractWe report the observation by angle-resolved photoemission spectroscopy of an impurity state located inside the superconducting gap of Ba 0.6 K 0.4 Fe 2 As 2 and vanishing above the superconducting critical temperature, for which the spectral weight is confined in momentum space near the Fermi wave-vector positions. We demonstrate, supported by theoretical simulations, that this in-gap state originates from weak scattering between bands with opposite sign of the superconducting-gap phase. This weak scattering, likely due to off-plane nonmagnetic (Ba, K) disorder, occurs mostly among neighboring Fermi surfaces, suggesting that the superconducting-gap phase changes sign within holelike (and electronlike) bands. Our results impose severe restrictions on the models promoted to explain high-temperature superconductivity in these materials.en_US
dc.identifier.citationZhang, P., Richard, P., Qian, T., et al.. "Observation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s± Pairing." <i>Physical Review X,</i> 4, no. 3 (2014) American Physical Society: https://doi.org/10.1103/PhysRevX.4.031001.en_US
dc.identifier.digitalObservation_Momentum-Confined_In-Gap_Impurity_Stateen_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevX.4.031001en_US
dc.identifier.urihttps://hdl.handle.net/1911/96574en_US
dc.language.isoengen_US
dc.publisherAmerican Physical Societyen_US
dc.rightsThis article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.en_US
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/en_US
dc.titleObservation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s± Pairingen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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