Charge current in a ferromagnet-superconductor junction with the pairing state of broken time-reversal symmetry

N. Stefanakis

doi:10.1103/PhysRevB.64.224502

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Charge current in a ferromagnet-superconductor junction with the pairing state of broken time-reversal symmetry

N. Stefanakis

DOI 10.1103/PhysRevB.64.224502 · Physical Review B

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Abstract

We calculate the tunneling-conductance spectra of a ferromagnetic metal/insulator/superconductor using the Blonder-Tinkham-Klapwijk formulation. Two possible states for the superconductor are considered with the time-reversal symmetry (T) broken, i.e., dx2−y2+is or dx2−y2+idxy. In 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 (dx2−y2+is)-wave case the peaks that exist when the ferromagnet 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 (dx2−y2+idxy)-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-Tc superconductors.