%0 Journal Article
%T Low-energy bound states at interfaces between superconducting and block antiferromagnet regions in KxFe{2-y}Se2
%A S. Mukherjee
%A M. N. Gastiasoro
%A P. J. Hirschfeld
%A B. M. Andersen
%J Physics
%D 2013
%I arXiv
%R 10.1103/PhysRevB.88.014519
%X The high-Tc alkali doped iron selenide superconductors KxFe{2-y}Se2 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 nonmagnetic scattering planes can provide a natural means to distinguish between these two leading pairing instabilities of the KxFe{2-y}Se2 materials.
%U http://arxiv.org/abs/1304.6424v1