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Synthesis and characterization of Mo-Nb films superconducting at 100-200 mK

Yefremenko, V., Zhang, J., Lisovenko, M., Barry, Peter, Bender, A., Cecil, T., Chang, C., Divan, R., Kuhlmann, S., Lowitz, A., Novosad, V., Padin, S., Pearson, J. and Wang, G. 2020. Synthesis and characterization of Mo-Nb films superconducting at 100-200 mK. Journal of Low Temperature Physics 199 (1-2) , pp. 306-311. 10.1007/s10909-019-02258-8

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Springer
ISSN: 0022-2291
Date of Acceptance: 8 November 2019
Last Modified: 09 Feb 2023 14:15

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