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Josephson current in s-wave superconductor / Sr_2RuO_4 junctions

Y. Asano·Y. Tanaka·M. Sigrist·S. Kashiwaya
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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 $\sin ϕ$ 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 $\sin 2ϕ$ . The spin-orbit scattering at the interfaces gives rise to the Josephson current proportional to $\cosϕ$, which is a direct consequence of the chiral paring symmetry in SRO.

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Y. Asano, Y. Tanaka, M. Sigrist, S. Kashiwaya. 2002-12-16. Josephson current in s-wave superconductor / Sr_2RuO_4 junctions. https://doi.org/10.1103/physrevb.67.184505

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