Josephson current in s-wave superconductor / Sr2RuO4 junctions
Y. Asano, Y. Tanaka, M. Sigrist, S. Kashiwaya
Abstract
The Josephson current between an s-wave and a spin-triplet superconductor Sr2RuO4 (SRO) is studied theoretically. In spin-singlet / spin-triplet superconductor junctions, there is no Josephson current proportional to ϕ in the absence of the spin-flip scattering near junction interfaces, where ϕ is a phase-difference across junctions. Thus a dominant term of the Josephson current is proportional to 2ϕ . The spin-orbit scattering at the interfaces gives rise to the Josephson current proportional to ϕ, which is a direct consequence of the chiral paring symmetry in SRO.
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