Low-energy bound states at interfaces between superconducting and block antiferromagnetic regions in KxFe2-ySe2

S. Mukherjee, M. N. Gastiasoro, P. J. Hirschfeld, B. M. Andersen

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3 Scopus citations

Abstract

The high-Tc alkali doped iron selenide superconductors K xFe2-ySe2 have been recently shown to be intrinsically phase separated into Fe vacancy ordered block antiferromagnetic regions and superconducting regions at low temperatures. In this work, we use a microscopic five orbital Hubbard model to obtain the electronic low-energy states near the interfaces between block antiferromagnets and superconductors. It is found that abundant low-energy in-gap bound states exist near such interfaces irrespective of whether the superconductor has d- or s-wave pairing symmetry. By contrast, it is shown how scattering from (110) boundaries can provide a natural means to distinguish between these two leading pairing instabilities of the KxFe2-ySe2 materials.

Original languageEnglish (US)
Article number014519
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number1
DOIs
StatePublished - Jul 22 2013

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