Physics – Condensed Matter – Superconductivity
Scientific paper
2006-10-16
Phys. Rev. B 75, 104509 (2007)
Physics
Condensed Matter
Superconductivity
12 pages (including 6 EPS figures)
Scientific paper
10.1103/PhysRevB.75.104509
We consider a SFS Josephson junction made of two superconductors S and a multidomain ferromagnet F with an in-plane magnetization. We assume that the neighboring domains of the ferromagnet are separated by Neel domain walls. An odd-frequency triplet long-range component of superconducting correlations arises in the domain walls and spreads into the domains over a long distance of the order $\xi_T = \sqrt{D / 2 \pi T}$, where $D$ is the diffusion coefficient (dirty limit is implied). We calculate the contribution of this component to the Josephson current in the situation when conventional short-range components exponentially decay over the thickness of the F layer and can be neglected. In the limit when the thickness of the F layer is much smaller than the penetration length of the long-range component, we find that the junction is in the $\pi$ state. We also analyze a correction to the density of states due to the long-range triplet component.
Efetov Konstantin B.
Fominov Ya. V.
Volkov A. F.
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