Model for Determining the Pairing Symmetry and Relative Sign of the Energy Gap of Iron-Arsenide Superconductors using Tunneling Spectroscopy

Da Wang; Yuan Wan; Qiang-Hua Wang

doi:10.1103/PhysRevLett.102.197004

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Model for Determining the Pairing Symmetry and Relative Sign of the Energy Gap of Iron-Arsenide Superconductors using Tunneling Spectroscopy

Da Wang, Yuan Wan, Qiang-Hua Wang

DOI 10.1103/PhysRevLett.102.197004 · Physical Review Letters

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Abstract

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 ν of the pairing gaps on the Γ and M Fermi pockets. For antiphase s-wave pairing, Andreev reflections can be thoroughly suppressed by interband destructive interference. This also occurs for tunneling along the antinodal (nodal) direction of antiphase (in-phase) d-wave gaps with distinctive line shapes in the spectra as compared to the s-wave case. If ν is reversed, Andreev reflections survive but are subject to interband decoherence due to quasiparticles.