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Theory of superconductor-ferromagnet point-contact spectra : The case of strong spin polarization

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2010

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Grein, Roland
Löfwander, Tomas
Metalidis, Georgo

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Physical Review B. American Physical Society (APS). 2010, 81(9), 094508. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.81.094508

Zusammenfassung

We study the impact of spin-active scattering on Andreev spectra of point contacts between superconductors (SC) and strongly spin-polarized ferromagnets (FM) using recently derived boundary conditions for the quasiclassical theory of superconductivity. We describe the interface region by a microscopic model for the interface scattering matrix. Our model includes both spin filtering and spin mixing and is nonperturbative in both transmission and spin polarization. We emphasize the importance of spin-mixing caused by interface scattering, which has been shown to be crucial for the creation of exotic pairing correlations in such structures. We provide estimates for the magnitude of this effect in different scenarios and discuss its dependence on various physical parameters. Our main finding is that the shape of the interface potential has a tremendous impact on the magnitude of the spin-mixing effect. Thus, all previous calculations, being based on delta-function or box-shaped interface potentials, underestimate this effect gravely. As a consequence, we find that with realistic interface potentials the spin-mixing effect can easily be large enough to cause spin-polarized subgap Andreev bound states in SC/FM point contacts. In addition, we show that our theory generalizes earlier models based on the Blonder-Tinkham-Klapwijk approach.

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ISO 690GREIN, Roland, Tomas LÖFWANDER, Georgo METALIDIS, Matthias ESCHRIG, 2010. Theory of superconductor-ferromagnet point-contact spectra : The case of strong spin polarization. In: Physical Review B. American Physical Society (APS). 2010, 81(9), 094508. ISSN 1098-0121. eISSN 1550-235X. Available under: doi: 10.1103/PhysRevB.81.094508
BibTex
@article{Grein2010Theor-51707,
  year={2010},
  doi={10.1103/PhysRevB.81.094508},
  title={Theory of superconductor-ferromagnet point-contact spectra : The case of strong spin polarization},
  number={9},
  volume={81},
  issn={1098-0121},
  journal={Physical Review B},
  author={Grein, Roland and Löfwander, Tomas and Metalidis, Georgo and Eschrig, Matthias},
  note={Article Number: 094508}
}
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