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- W2037507692 abstract "We study an ac Josephson effect in a SC/I/X/I/SC junction, where SC is an s-wave superconductor, I is an insulator, and X is either a normal metal (NM) or a ferromagnetic metal (FM). Using a tunneling Hamiltonian and Green’s function method, we obtain two types of superconducting phase dependent current. One is the Josephson current and the other is the quasiparticle-pair-interference current (QPIC). In a SC/I/NM/I/SC junction, the Josephson critical current (Ic1) and the amplitude of QPIC (Ic2) are functions of the thickness of NM and the applied voltage (V). Ic1 shows a logarithmic divergence called Riedel peak at the gap voltage, V=2Δ/e, where Δ is the superconducting gap, and Ic2 shows a discontinuous jump at the gap voltage. These behaviors are similar to these of SC/I/SC junctions. On the other hand, in a SC/I/FM/I/SC junction, Ic1 and Ic2 exhibit the strong dependence on the thickness of FM and changes their signs by crossing the 0–π transition point due to the magnetic exchange splitting between the up- and down-spin bands in FM. It is predicted that the Riedel peak in Ic1 disappears at the 0–π transition and the 0–π transition occurs in Ic2 similarly to Ic1." @default.
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- W2037507692 date "2008-09-01" @default.
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- W2037507692 title "Theoretical study of ac Josephson effect in a double barrier Josephson junction" @default.
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- W2037507692 doi "https://doi.org/10.1016/j.physc.2008.05.159" @default.
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