A theory of Andreev conductance is formulated for junctions involving normal metals (N) and multiband superconductors (S) and applied to the case of superconductors with nodeless extended s±-wave order parameter symmetry, as possibly realized in the recently discovered ferropnictides. We find qualitative differences from tunneling into s-wave or d-wave superconductors that may help to identify such a state. First, interband interference leads to a suppression of Andreev reflection in the case of a highly transparent N/S interface and to a current deficit in the tunneling regime. Second, surface bound states may appear, both at zero and at nonzero energies.
Golubov, A. A., Brinkman, A., Tanaka, Y., Mazin, I. I., & Dolgov, O. V. (2009). Andreev spectra and subgap bound states in multiband superconductors. Physical review letters, 103(7), 077003-. https://doi.org/10.1103/PhysRevLett.103.077003