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Superconducting Proximity Effect in Crystalline Co and Cu Nanowires

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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 (T c = 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.

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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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Authors and Affiliations

  1. Physikalisches Institut, Goethe University, 60438, Frankfurt am Main, Germany

    Maksym Kompaniiets, Oleksandr V. Dobrovolskiy & Michael Huth

  2. Department of Materials Science, TU Darmstadt, 64287, Darmstadt, Germany

    Cornelia Neetzel & Wolfgang Ensinger

  3. Physics Department, V. Karazin National University, 61077, Kharkiv, Ukraine

    Oleksandr V. Dobrovolskiy

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  1. Maksym Kompaniiets
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  2. Oleksandr V. Dobrovolskiy
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  4. Wolfgang Ensinger
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Correspondence to Maksym Kompaniiets.

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Kompaniiets, M., Dobrovolskiy, O.V., Neetzel, C. et al. Superconducting Proximity Effect in Crystalline Co and Cu Nanowires. J Supercond Nov Magn 28, 431–436 (2015). https://doi.org/10.1007/s10948-014-2694-x

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  • DOI: https://doi.org/10.1007/s10948-014-2694-x

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