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Synthesis of Thin Niobium Films on Silicon and Study of Their Superconducting Properties in the Dimensional Crossover Region

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Abstract

Niobium films with a thickness of 4–100 nm are synthesized on a silicon substrate under ultrahigh vacuum conditions. Measurements of the electrical resistance show a high superconducting transition temperature Tc in the range of 4.7–9.1 K and record-breaking small transition widths ΔTc in the range of 260–11 m. The dependences of Tc and ΔTc on the magnetic field are investigated, and the superconducting coherence lengths and mean free paths of conduction electrons for different thicknesses of the synthesized films are determined. A significant influence of the magnetic field on ΔTc is found, which reveals the transition from three- to two-dimensional superconductivity at thicknesses below 10 nm. The dependences of Tc and ΔTc on the thickness of the films and the magnitude of the magnetic field are discussed within the framework of existing theories of superconductivity in thin films of superconducting metals.

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Funding

The work was carried out with the financial support of the Russian Foundation for Basic Research (project no. 18-32-01041 mol_a) using the equipment of the Federal Center for Collective Use of FHI of Kazan Federal University and the Interdisciplinary Center for Analytical Microscopy of Kazan Federal University. The work of L.R. Tagirov was supported by a state assignment to the Federal Research Center of Kazan Scientific Center of the Russian Academy of Sciences, no. АААА-А18-118030690040-8.

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Authors and Affiliations

  1. Kazan Federal University, 420008, Kazan, Russia

    I. V. Yanilkin, A. I. Gumarov, A. M. Rogov & R. V. Yusupov

  2. Zavoisky Physical–Technical Institute, FRC Kazan Scientific Center of Russian Academy of Sciences, 420029, Kazan, Russia

    A. I. Gumarov & L. R. Tagirov

  3. Tatarstan Academy of Sciences, Institute of Applied Research, 420111, Kazan, Russia

    L. R. Tagirov

Authors
  1. I. V. Yanilkin
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  2. A. I. Gumarov
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  3. A. M. Rogov
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  4. R. V. Yusupov
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  5. L. R. Tagirov
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Correspondence to I. V. Yanilkin.

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Translated by S. Rostovtseva

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Yanilkin, I.V., Gumarov, A.I., Rogov, A.M. et al. Synthesis of Thin Niobium Films on Silicon and Study of Their Superconducting Properties in the Dimensional Crossover Region. Tech. Phys. 66, 263–268 (2021). https://doi.org/10.1134/S1063784221020249

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