Sign reversal of ac Josephson current in a ferromagnetic Josephson junction

Details Sign reversal of ac Josephson current in a ferromagnetic Josephson junction Sign reversal of ac Josephson current in a ferromagnetic Josephson junction

2008-09-09

arxiv.org/abs/0809.1470v2

J. Phys. Soc. Jpn. 78 (2009) 014708

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 6 figures

Scientific paper

10.1143/JPSJ.78.014708

The ac Josephson effect in a ferromagnetic Josephson junction, which is composed of two superconductors separated by a ferromagnetic metal (FM), is studied by a tunneling Hamiltonian and Green's function method. We obtain two types of superconducting phase dependent current, i.e., Josephson current and quasiparticle-pair-interference current (QPIC). These currents change their signs with thickness of the FM layer due to the 0-$\pi$ transition characteristic to the ferromagnetic Josephson junction. As a function of applied voltage, the Josephson critical current shows a logarithmic divergence called the Riedel peak at the gap voltage, while the QPIC shows a discontinuous jump. The Riedel peak reverses due to the 0-$\pi$ transition and disappears near the 0-$\pi$ transition point. The discontinuous jump in the QPIC also represents similar behaviors to the Riedel peak. These results are in contrast to the conventional ones.

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