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The high-Tc alkali doped iron selenide superconductors KxFe{2-y}Se2 have beenrecently shown to be intrinsically phase separated into Fe vacancy orderedblock antiferromagnetic regions and superconducting regions at lowtemperatures. In this work, we use a microscopic five orbital Hubbard model toobtain the electronic low-energy states near the interfaces between blockantiferromagnets and superconductors. It is found that abundant low-energyin-gap bound states exist near such interfaces irrespective of whether thesuperconductor has d- or s-wave pairing symmetry. By contrast, it is shown hownonmagnetic scattering planes can provide a natural means to distinguishbetween these two leading pairing instabilities of the KxFe{2-y}Se2 materials.

Low-energy bound states at interfaces between superconducting and block antiferromagnet regions in KxFe{2-y}Se2