%0 Journal Article
%T Possible pi-phase shift at interface of two pnictides with antiphase s-wave pairing
%A Wei-Qiang Chen
%A Fu-Chun Zhang
%J Physics
%D 2010
%I arXiv
%R 10.1103/PhysRevB.83.212501
%X We examine the nature of Josephson junction between two identical Fe-pnictides with anti-phase s-wave pairing. pi-phase shift is found if the junction barrier is thick and the two Fe-pnictides are oriented in certain directions relative to the interface. Our theory provides a possible explanation for the observed half integer flux quantum transitions in a niobium/polycrystal NdFeAsO loop, and attributes the pi-phase shift to intergrain junctions of Fe-pnictides.
%U http://arxiv.org/abs/1009.4756v1