Surface-angle dependence of the tunneling spectroscopy in iron-based superconductors: Sign-reversing s-wave scenarios

We discuss the surface Andreev bound states in Fe-based superconductors with the use of an effective five-band model and investigate the surface-angle dependence of the tunneling spectroscopy by a quasi-classical approach for an isotropic and an anisotropic +/- s-wave gap superconductivity. We show that information on the normal state is important for the Andreev bound state and its peak positions do not depend on the gap amplitude anisotropy. (C) 2009 Elsevier B.V. All rights reserved.