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• W2049827188 abstract "We present a theoretical study of the effect of spin-filtering on the Josephson and dissipative quasiparticle currents in a superconducting tunnel junction. By combining the quasiclassical Green's functions and the tunneling Hamiltonian method we describe the transport properties of a generic junction consisting of two superconducting leads with an effective exchange field h separated by a spin-filter insulating barrier. We show that besides the tunneling of Cooper pairs with total spin-projection Sz = 0 there is another contribution to the Josephson current due to equal-spin Cooper pairs. The latter is finite and not affected by the spin-filter effect provided that the fields h and the magnetization of the barrier are non-collinear . We also determine the quasiparticle current for a symmetric junction and show that the differential conductance may exhibit peaks at different values of the voltage depending on the polarization of the spin-filter, and the relative angle between the exchange fields and the magnetization of the barrier. Our findings provide a plausible explanation for existing experiments on Josephson junctions with magnetic barriers, predict new effects and show how spin-polarized supercurrents in hybrid structures can be created." @default.
• W2049827188 created "2016-06-24" @default.
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• W2049827188 date "2012-08-08" @default.
• W2049827188 modified "2023-10-06" @default.
• W2049827188 title "Spin-polarized Josephson and quasiparticle currents in superconducting spin-filter tunnel junctions" @default.
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• W2049827188 doi "https://doi.org/10.1103/physrevb.86.060506" @default.
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