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

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dc.citation.articleNumber31001
dc.citation.issueNumber3
dc.citation.journalTitlePhysical Review X
dc.citation.volumeNumber4
dc.contributor.authorZhang, P.
dc.contributor.authorRichard, P.
dc.contributor.authorQian, T.
dc.contributor.authorShi, X.
dc.contributor.authorMa, J.
dc.contributor.authorZeng, L.-K.
dc.contributor.authorWang, X.-P.
dc.contributor.authorRienks, E.
dc.contributor.authorZhang, C.-L.
dc.contributor.authorDai, Pengcheng
dc.contributor.authorYou, Y.-Z.
dc.contributor.authorWeng, Z.-Y.
dc.contributor.authorWu, X.-X.
dc.contributor.authorHu, J.P.
dc.contributor.authorDing, H.
dc.date.accessioned2017-08-04T12:29:40Z
dc.date.available2017-08-04T12:29:40Z
dc.date.issued2014
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.
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.
dc.identifier.digitalObservation_Momentum-Confined_In-Gap_Impurity_State
dc.identifier.doihttps://doi.org/10.1103/PhysRevX.4.031001
dc.identifier.urihttps://hdl.handle.net/1911/96574
dc.language.isoeng
dc.publisherAmerican Physical Society
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.
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.titleObservation of Momentum-Confined In-Gap Impurity State in Ba0.6K0.4Fe2As2: Evidence for Antiphase s± Pairing
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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