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      Odd triplet superconductivity in superconductor-ferromagnet structures with a narrow domain wall

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          Abstract

          We study the proximity effect in superconductor-ferromagnet (SF) structure with a narrow domain wall (DW) at the SF interface. The width of the domain wall is assumed to be larger than the Fermi wave length, but smaller than other characteristic lengths (for example, the ''magnetic'' length). The transmission coefficient is supposed to be small so that we deal with a weak proximity effect. Solving the linearized Eilenberger equation, we find analytical expressions for quasiclassical Green's functions. These functions describe the short-range (SR) condensate components, singlet and triplet with zero projection of the total spin on the quantization z-axis, induced in F due to the proximity effect as well as long-range odd triplet component (LRTC) with a nonzero projection of the total spin of Cooper pairs on the \(z\)% -axis. The amplitude of the LRTC essentially depends on the product \(h\tau \) and increases with increasing the exchange energy \(h\) (\(\tau \) is the elastic scattering time). We calculate the Josephson current in SFS junction with a thickness of the F layer much greater than the penetration length of the SR components. The Josephson critical current caused by the LRTC may be both positive and negative depending on chirality of the magnetic structure in F. The density of states (DOS) in a diffusive SF bilayer is also analyzed. It is shown that the contributions of the SR and LR components to the DOS in F have a different dependence on the thickness \(d\) of the F layer (nonmonotonous and monotonous).

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          Author and article information

          Journal
          21 February 2008
          2008-05-15
          Article
          10.1103/PhysRevB.78.024519
          0802.3151
          1ae9ac7f-0f56-4708-904b-cb97bd0e8b21

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          Phys. Rev. B 78, 024519 (2008)
          14 pages, 3 Figs. submitted to Phys. Rev. B
          cond-mat.supr-con cond-mat.mes-hall

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