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Evidence of nematic order and nodal superconducting gap along [110] direction in RbFe₂As₂

Liu, Xi; Tao, Ran; Ren, Mingqiang; Chen, Wei; Yao, Qi; Wolf, Thomas; Yan, Yajun; Zhang, Tong; Feng, Donglai

Abstract:
Unconventional superconductivity often intertwines with various forms of order, such as the nematic order which breaks the rotational symmetry of the lattice. Here we report a scanning tunneling microscopy study on RbFe2As2, a heavily hole-doped Fe-based superconductor (FeSC). We observe significant symmetry breaking in its electronic structure and magnetic vortex which differentiates the (π, π) and (π, -π) directions of the unfolded Brillouin zone. It is thus a novel nematic state, distinct from the nematicity of undoped/lightly-doped FeSCs which breaks the (π, 0)/(0, π) equivalence. Moreover, we observe a clear V-shaped superconducting gap. The gap is suppressed on surface Rb vacancies and step edges, and the suppression is particularly strong at the [110]-oriented edges. This is possibly due to a dx2−y2 like pairing component with nodes along the [110] directions. Our results thus highlight the intimate connection between nematicity and superconducting pairing in iron-based superconductors.

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Verlagsausgabe §
DOI: 10.5445/IR/1000092128
Veröffentlicht am 13.03.2019
Originalveröffentlichung
DOI: 10.1038/s41467-019-08962-z
Coverbild
Zugehörige Institution(en) am KIT Institut für Festkörperphysik (IFP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2041-1723
urn:nbn:de:swb:90-921289
KITopen-ID: 1000092128
HGF-Programm 43.21.01 (POF III, LK 01)
Erschienen in Nature Communications
Band 10
Heft 1
Seiten Article No.1039
Vorab online veröffentlicht am 04.03.2019
Nachgewiesen in Scopus
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