Josephson current in s-wave superconductor / Sr_2RuO_4 junctions
arXiv:cond-mat/0212353 · doi:10.1103/PhysRevB.67.184505
Abstract
The Josephson current between an s-wave and a spin-triplet superconductor Sr$_2$RuO$_4$ (SRO) is studied theoretically. In spin-singlet / spin-triplet superconductor junctions, there is no Josephson current proportional to $\sin Ï$ in the absence of the spin-flip scattering near junction interfaces, where $Ï$ is a phase-difference across junctions. Thus a dominant term of the Josephson current is proportional to $\sin 2Ï$ . The spin-orbit scattering at the interfaces gives rise to the Josephson current proportional to $\cosÏ$, which is a direct consequence of the chiral paring symmetry in SRO.