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 superconduct or 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 no rmal 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 t he quasiparticle tunneling into the superconductor. In addition, the p airing breaking of peaks in the conductance is exhibited if the ferrom agnet layer is located several superconducting coherence lengths away from the normal metal-superconductor interface.