Triplet supercurrent due to spin-active zones in a Josephson junction
Journal article, Peer reviewed
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Original versionPhysical Review B. Condensed Matter and Materials Physics. 2010, 82 (2), . 10.1103/PhysRevB.82.020512
Motivated by a recent experiment evidencing triplet superconductivity in a ferromagnetic Josephson junction with a Cu2MnAl-Heusler barrier, we construct a theoretical model accounting for this observation. The key ingredients in our model which generate the triplet supercurrent are spin-active zones, characterized 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.