{
  "id": "cond-mat/0406275",
  "version": "v2",
  "published": "2004-06-11T13:39:55.000Z",
  "updated": "2004-08-27T11:08:18.000Z",
  "title": "sin(2 phi) current-phase relation in SFS junctions with decoherence in the ferromagnet",
  "authors": [
    "R. Mélin"
  ],
  "comment": "7 pages, 3 figures, article rewritten",
  "journal": "Europhys. Lett. 69, 121 (2005)",
  "doi": "10.1209/epl/i2004-10303-6",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.supr-con"
  ],
  "abstract": "We propose a theoretical description of the sin(2 phi) current-phase relation in SFS junctions at the 0-$\\pi$ cross-over obtained in recent experiments by Sellier et al. [Phys. Rev. Lett. 92, 257005 (2004)] where it was suggested that a strong decoherence in the magnetic alloy can explain the magnitude of the residual supercurrent at the 0-pi cross-over. To describe the interplay between decoherence and elastic scattering in the ferromagnet we use an analogy with crossed Andreev reflection in the presence of disorder. The supercurrent as a function of the length R of the ferromagnet decays exponentially over a length xi, larger than the elastic scattering length $l_d$ in the absence of decoherence, and smaller than the coherence length $l_\\phi$ in the absence of elastic scattering on impurities. The best fit leads to $\\xi \\simeq \\xi_h^{({\\rm diff})}/3$, where $\\xi_h^{({\\rm diff})}$ is exchange length of the diffusive system without decoherence (also equal to $\\xi$ in the absence of decoherence). The fit of experiments works well for the amplitude of both the sin(phi) and sin(2 phi) harmonics.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2004-08-27T11:08:18.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "current-phase relation",
      "sfs junctions",
      "best fit",
      "coherence length",
      "crossed andreev reflection"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}