Journal of Superconductivity and Novel Magnetism

, Volume 28, Issue 2, pp 431–436 | Cite as

Superconducting Proximity Effect in Crystalline Co and Cu Nanowires

  • Maksym Kompaniiets
  • Oleksandr V. Dobrovolskiy
  • Cornelia Neetzel
  • Wolfgang Ensinger
  • Michael Huth
Original Paper

Abstract

Superconducting proximity effect is investigated by electrical resistance measurements in individual single-crystal Cu and polycrystalline Co nanowires in contact with a W-based floating inducer electrode (Tc = 5.2 K). Our analysis of the resistance drops shows that in both nanowires, (i)the superconducting proximity length ξ is of the order of 1 μm at 2.4 K and (ii) its temperature dependencies can be fitted well to an expression of the form \(\xi (T) \propto \sqrt {1/T}\) in a wide temperature range, in good agreement with the theoretical predictions for ξ(T) in the diffusive limit. For the Co nanowire, dependencies of the spin-triplet ξ upon current and magnetic field are also reported.

Keywords

Superconducting proximity effect Single nanowires Focused particle beams Nanopatterning Electrical resistance measurements 

Notes

Acknowledgements

The authors thank R. Sachser for support in automating the data acquisition and C. Trautmann and M. E. Toimil-Molares for providing ion-track etched polycarbonate templates. J. Brötz is thanked for doing XRD measurements. Discussions with K. Arutyunov and A. Buzdin are acknowledged. This work was supported by the Beilstein Institut, Frankfurt/M, within the research collaboration NanoBiC. This work was done within the framework of the NanoSC-COST Action MP120.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Maksym Kompaniiets
    • 1
  • Oleksandr V. Dobrovolskiy
    • 1
    • 3
  • Cornelia Neetzel
    • 2
  • Wolfgang Ensinger
    • 2
  • Michael Huth
    • 1
  1. 1.Physikalisches InstitutGoethe UniversityFrankfurt am MainGermany
  2. 2.Department of Materials ScienceTU DarmstadtDarmstadtGermany
  3. 3.Physics DepartmentV. Karazin National UniversityKharkivUkraine

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