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

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dc.citation.articleNumber134520
dc.citation.issueNumber13
dc.citation.journalTitlePhysical Review B
dc.citation.volumeNumber99
dc.contributor.authorLi, Ang
dc.contributor.authorYin, Jia-Xin
dc.contributor.authorWang, Jihui
dc.contributor.authorWu, Zheng
dc.contributor.authorMa, Jihua
dc.contributor.authorSefat, Athena S.
dc.contributor.authorSales, Brian C.
dc.contributor.authorMandrus, David G.
dc.contributor.authorMcGuire, Michael A.
dc.contributor.authorJin, Rongying
dc.contributor.authorZhang, Chenglin
dc.contributor.authorDai, Pengcheng
dc.contributor.authorLv, Bing
dc.contributor.authorChu, Ching-Wu
dc.contributor.authorLiang, Xuejin
dc.contributor.authorHor, P.-H.
dc.contributor.authorTing, C.-S.
dc.contributor.authorPan, Shuheng H.
dc.date.accessioned2019-08-13T15:19:41Z
dc.date.available2019-08-13T15:19:41Z
dc.date.issued2019
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.
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.
dc.identifier.doihttps://doi.org/10.1103/PhysRevB.99.134520
dc.identifier.urihttps://hdl.handle.net/1911/106231
dc.language.isoeng
dc.publisherAmerican Physical Society
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.
dc.titleSurface terminations and layer-resolved tunneling spectroscopy of the 122 iron pnictide superconductors
dc.typeJournal article
dc.type.dcmiText
dc.type.publicationpublisher version
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