Josephson supercurrent with spin-equal pairing through a half-metallic link

Abstract

Taking into account spin-flip scattering at superconductor/half-metallic ferromagnet (S/F)interfaces in S/F/S Josephson junctions, we extend the Blonder–Tinkham–Klapwijkapproach and novel Andreev reflection idea to studying the Josephson current and spatiallydependent superconducting order parameters for singlet and triplet pairing states. It isfound that the novel Andreev reflection at the F/S interfaces can result in electron–holecorrelations in one spin subband of the F and a large supercurrent of spin-equal pairingthrough a long half-metallic link.