Surface terminations and layer-resolved tunneling spectroscopy of the 122 iron pnictide superconductors

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dc.citation.articleNumber134520en_US
dc.citation.issueNumber13en_US
dc.citation.journalTitlePhysical Review Ben_US
dc.citation.volumeNumber99en_US
dc.contributor.authorLi, Angen_US
dc.contributor.authorYin, Jia-Xinen_US
dc.contributor.authorWang, Jihuien_US
dc.contributor.authorWu, Zhengen_US
dc.contributor.authorMa, Jihuaen_US
dc.contributor.authorSefat, Athena S.en_US
dc.contributor.authorSales, Brian C.en_US
dc.contributor.authorMandrus, David G.en_US
dc.contributor.authorMcGuire, Michael A.en_US
dc.contributor.authorJin, Rongyingen_US
dc.contributor.authorZhang, Chenglinen_US
dc.contributor.authorDai, Pengchengen_US
dc.contributor.authorLv, Bingen_US
dc.contributor.authorChu, Ching-Wuen_US
dc.contributor.authorLiang, Xuejinen_US
dc.contributor.authorHor, P.-H.en_US
dc.contributor.authorTing, C.-S.en_US
dc.contributor.authorPan, Shuheng H.en_US
dc.date.accessioned2019-08-13T15:19:41Zen_US
dc.date.available2019-08-13T15:19:41Zen_US
dc.date.issued2019en_US
dc.description.abstractThe surface terminations of 122-type alkaline earth metal iron pnictides AEFe2As2(AE=Ca,Ba) are investigated with scanning tunneling microscopy/spectroscopy. Cleaving these crystals at a cryogenic temperature yields a large majority of terminations with an atomically resolved (√2 × √2)R45 or 1 × 2 lattice, as well as a very rare termination of 1 × 1 lattice symmetry. By analyzing the lattice registration and selective chemical marking, we identify these terminations as (√2 × √2)R45-reconstructed AE, 1 × 2-reconstructed As, and (√2 × √2)R45-reconstructed Fe surface layers, respectively. Layer-resolved tunneling spectroscopy on these terminating surfaces reveals a well-defined superconducting energy gap on the As terminations, while the gap features become weaker on the AE terminations and absent on the Fe terminations. The superconducting gap is hardly affected locally by the As or AE surface reconstructions. The definitive identification of the surface terminations and the associated spectroscopic signatures shed light on the essential roles of As and the pnictogen-iron-pnictogen trilayer building block in iron-based superconductivity.en_US
dc.identifier.citationLi, Ang, Yin, Jia-Xin, Wang, Jihui, et al.. "Surface terminations and layer-resolved tunneling spectroscopy of the 122 iron pnictide superconductors." <i>Physical Review B,</i> 99, no. 13 (2019) American Physical Society: https://doi.org/10.1103/PhysRevB.99.134520.en_US
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.99.134520en_US
dc.identifier.urihttps://hdl.handle.net/1911/106231en_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.titleSurface terminations and layer-resolved tunneling spectroscopy of the 122 iron pnictide superconductorsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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