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Detecting sign-changing superconducting gap in LiFeAs using quasiparticle interference

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dc.date.accessioned 2019-01-22T20:58:43Z
dc.date.available 2019-01-22T20:58:43Z
dc.date.issued 2018
dc.identifier.issn 2469-9950
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/149711
dc.description.abstract © 2018 American Physical Society. Using a realistic ten-orbital tight-binding model Hamiltonian fitted to the angle-resolved photoemission spectroscopy data on LiFeAs, we analyze the temperature, frequency, and momentum dependencies of quasiparticle interference to identify gap sign changes in a qualitative way, following our original proposal [Phys. Rev. B 92, 184513 (2015)PRBMDO1098-012110.1103/PhysRevB.92.184513]. We show that all features present for the simple two-band model for the sign-changing s+ - wave superconducting gap employed previously are still present in the realistic tight-binding approximation and gap values observed experimentally. We discuss various superconducting gap structures proposed for LiFeAs and identify various features of these superconducting gap functions in the quasiparticle interference patterns. On the other hand, we show that it will be difficult to identify the more complicated possible sign structures of the hole pocket gaps in LiFeAs due to the smallness of the pockets and the near proximity of two of the gap energies.
dc.relation.ispartofseries Physical Review B
dc.title Detecting sign-changing superconducting gap in LiFeAs using quasiparticle interference
dc.type Article
dc.relation.ispartofseries-issue 5
dc.relation.ispartofseries-volume 97
dc.collection Публикации сотрудников КФУ
dc.source.id SCOPUS24699950-2018-97-5-SID85043759436


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  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

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