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Synthesis and Characterization of Mo–Nb Films Superconducting at 100–200 mK

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Abstract

We have developed a new transition-edge sensor material with critical temperature (Tc) in the range 100–200 mK. The new material is a solid solution of two superconducting components, MoxNb1−x, co-sputtered from two high-purity single-component targets (Mo and Nb). The Tc has a minimum (dTc/dx = 0) at an intermediate concentration of the components. We have optimized the deposition parameters and composition to provide films with a sharp superconducting transition at ~ 150 mK. We investigated structural features of the films and surface morphology using X-ray diffraction (XRD) and scanning electron microscopy. The XRD measurements indicate that the grown films are polycrystalline, with a preferred orientation along the (110) crystal direction and a clear correlation between superconducting properties and film microstructure.

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Acknowledgements

This work was supported in part by the Office of Science and the Office of Basic Energy Sciences of the US Department of Energy under Contract DE-AC02-06CH11357; Use of the Center for Nanoscale Materials, an Office of Science user facility, was supported by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

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Authors and Affiliations

  1. High-Energy Physics Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL, 60439, USA

    V. Yefremenko, J. Zhang, P. Barry, A. Bender, T. Cecil, C. Chang, S. Kuhlmann, S. Padin & G. Wang

  2. Material Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL, 60439, USA

    M. Lisovenko, V. Novosad & J. Pearson

  3. Nanoelectronics Department, Sumy State University, 2 Rymskogo-Korsakova St., Sumy, 40007, Ukraine

    M. Lisovenko

  4. Kavli Institute for Cosmological Physics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL, 60637, USA

    A. Bender, C. Chang, A. Lowitz & S. Padin

  5. Center for Nanoscale Materials, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL, 60439, USA

    R. Divan

  6. Physics Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL, 60439, USA

    V. Novosad

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  1. V. Yefremenko
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  2. J. Zhang
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  3. M. Lisovenko
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  4. P. Barry
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  6. T. Cecil
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  7. C. Chang
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  8. R. Divan
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  9. S. Kuhlmann
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  10. A. Lowitz
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  11. V. Novosad
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  12. S. Padin
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  13. J. Pearson
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  14. G. Wang
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Correspondence to V. Yefremenko.

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Yefremenko, V., Zhang, J., Lisovenko, M. et al. Synthesis and Characterization of Mo–Nb Films Superconducting at 100–200 mK. J Low Temp Phys 199, 306–311 (2020). https://doi.org/10.1007/s10909-019-02258-8

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  • DOI: https://doi.org/10.1007/s10909-019-02258-8

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