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Model for Determining the Pairing Symmetry and Relative Sign of the Energy Gap of Iron-Arsenide Superconductors using Tunneling Spectroscopy
We demonstrate that tunneling into multiband iron-arsenide superconductors through a wide junction in the transparent limit can provide unambiguous signatures for the symmetry and relative sign nu of the pairing gaps on the Gamma and M Fermi pockets. For antiphase s-wave pairing, Andreev reflections can be thoroughly suppressed by interband …