Triplet supercurrent due to spin-active zones in a Josephson junction

Details Triplet supercurrent due to spin-active zones in a Josephson junction Triplet supercurrent due to spin-active zones in a Josephson junction

2010-04-28

arxiv.org/abs/1004.5124v2

Phys. Rev. B 82, 020512(R) (2010)

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures. Revised version with additional results. Accepted for publication in PRB Rapid Communications

Scientific paper

Motivated by a recent experiment evidencing triplet superconductivity in a ferromagnetic Josephson junction with a Cu$_2$MnAl-Heusler barrier, we construct a theoretical model accounting for this observation. The key ingredients in our model which generate the triplet supercurrent are \textit{spin-active zones}, characterised by an effective canted interface magnetic moment. Using a numerical solution of the quasiclassical equations of superconductivity with spin-active boundary conditions, we find qualitatively very good agreement with the experimentally observed supercurrent. Further experimental implications of the spin-active zones are discussed.

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