Charge Current in Ferromagnet-superconductor Junction with Pairing State of Broken Time-reversal Symmetry. Typeset Using Revt E X 1

We calculate the tunneling conductance spectra of a ferromagnetic metal/insulator/superconductor using the Blonder-Tinkham-Klapwijk (BTK) formulation. Two possible states for the superconductor are considered with the time reversal symmetry (T) broken, i. both cases the tunneling conductance within the gap is suppressed with the increase of the exchange interaction due to the suppression of the Andreev reflection. In the (d x 2 −y 2 + is)-wave case the peaks that exist when the fer-romagnet is a normal metal in the amplitude of the s-wave component due to the bound state formation are reduced symmetrically, with the increase of the exchange field, while in the (d x 2 −y 2 + id xy)-wave case the residual density of states within the gap develops a dip around E = 0 with the increase of the exchange field. These results would be useful to discriminate between T-broken pairing states near the surface in high-T c superconductors.