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Ultra-fast vortex motion in a direct-write Nb-C superconductor

Author

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  • O. V. Dobrovolskiy

    (University of Vienna
    School of Physics, V. Karazin Kharkiv National University)

  • D. Yu Vodolazov

    (Institute for Physics of Microstructures, Russian Academy of Sciences
    Moscow Pedagogical State University)

  • F. Porrati

    (Institute of Physics, Goethe University)

  • R. Sachser

    (Institute of Physics, Goethe University)

  • V. M. Bevz

    (School of Physics, V. Karazin Kharkiv National University)

  • M. Yu Mikhailov

    (B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine)

  • A. V. Chumak

    (University of Vienna)

  • M. Huth

    (Institute of Physics, Goethe University)

Abstract

The ultra-fast dynamics of superconducting vortices harbors rich physics generic to nonequilibrium collective systems. The phenomenon of flux-flow instability (FFI), however, prevents its exploration and sets practical limits for the use of vortices in various applications. To suppress the FFI, a superconductor should exhibit a rarely achieved combination of properties: weak volume pinning, close-to-depairing critical current, and fast heat removal from heated electrons. Here, we demonstrate experimentally ultra-fast vortex motion at velocities of 10–15 km s−1 in a directly written Nb-C superconductor with a close-to-perfect edge barrier. The spatial evolution of the FFI is described using the edge-controlled FFI model, implying a chain of FFI nucleation points along the sample edge and their development into self-organized Josephson-like junctions (vortex rivers). In addition, our results offer insights into the applicability of widely used FFI models and suggest Nb-C to be a good candidate material for fast single-photon detectors.

Suggested Citation

  • O. V. Dobrovolskiy & D. Yu Vodolazov & F. Porrati & R. Sachser & V. M. Bevz & M. Yu Mikhailov & A. V. Chumak & M. Huth, 2020. "Ultra-fast vortex motion in a direct-write Nb-C superconductor," Nature Communications, Nature, vol. 11(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16987-y
    DOI: 10.1038/s41467-020-16987-y
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