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We investigate the effect of magnetic impurities on the local quasiparticledensity of states (LDOS) in iron-based superconductors. Employing thetwo-orbital model where 3$d$ electron and hole conduction bands are hybridizingwith the localized $f$-orbital of the impurity spin, we investigate how varioussymmetries of the superconducting gap and its nodal structure influence thequasiparticle excitations and impurity bound states. We show that the boundstates behave qualitatively different for each symmetry. Most importantly wefind that the impurity-induced bound states can be used to identify the nodalstructure of the extended s-wave symmetry ($S^{\pm}$) that is activelydiscussed in ferropnictides.

Magnetic impurity resonance states and symmetry of the superconducting order parameter in iron-based superconductors