Midgap surface bound states as signatures of possible $s^{\pm}$-wave pairing in Fe-pnictide superconductors

Details Midgap surface bound states as signatures of possible $s^{\pm}$-wave pairing in Fe-pnictide superconductors Midgap surface bound states as signatures of possible $s^{\pm}$-wave pairing in Fe-pnictide superconductors

2011-04-28

arxiv.org/abs/1104.5282v1

Physics

Condensed Matter

Superconductivity

10 pages, 2 figures

Scientific paper

Appreciable zero-energy surface bound states are shown to exist in Fe-pnictide superconductors with antiphase $s^{\pm}$-wave pairing. In contrast to the [110] bound states in d-wave superconductors, these bound states arise from the non-conservation of momentum perpendicular to the interface for tunneling electrons and the $s^{\pm}$ pairing, and hence they can only exist in a small window ($\sim \pm 6^{\circ}$)in the orientation of edges near [100] direction. Our results explain why zero-bias conductance peak was often observed in tunneling spectrum and when it disappears, two coherent peaks show up, providing unambiguous signals to test the possible $s^{\pm}$-wave pairing in Fe-pnictide superconductors.

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