Ferromagnetic scattering effects on quantum transport in a normal metal-superconductor junction

Within a scattering formalism, the ferromagnetic scattering effects on the transport properties of a normal metal attached to a superconductor have been studied. It is shown the exchange interaction could lead to the resemblance of the conductance behavior between a normal metal-s-wave superconductor junction containing a ferromagnet layer and a normal metal-d-wave superconductor with a nonmagnetic scattering layer, and vice versa. This result may complicate significantly the decisive determination of the pairing symmetry in high-T_c superconductors by the quasiparticle tunneling into the superconductor. In addition, the pairing breaking of peaks in the conductance is exhibited if the ferromagnet layer is located several superconducting coherence lengths away from the normal metal-superconductor interface.