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Coherent flux tunneling through NbN nanowires

J. T. Peltonen, O. V. Astafiev, Yu. P. Korneeva, B. M. Voronov, A. A. Korneev, I. M. Charaev, A. V. Semenov, G. N. Golt'sman, L. B. Ioffe, T. M. Klapwijk, and J. S. Tsai
Phys. Rev. B 88, 220506(R) – Published 17 December 2013
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Abstract

We demonstrate evidence of coherent magnetic flux tunneling through superconducting nanowires patterned in a thin highly disordered NbN film. The phenomenon is revealed as a superposition of flux states in a fully metallic superconducting loop with the nanowire acting as an effective tunnel barrier for the magnetic flux, and reproducibly observed in different wires. The flux superposition achieved in the fully metallic NbN rings proves the universality of the phenomenon previously reported for InOx. We perform microwave spectroscopy and study the tunneling amplitude as a function of the wire width, compare the experimental results with theories, and estimate the parameters for existing theoretical models.

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  • Received 3 May 2013

DOI:https://doi.org/10.1103/PhysRevB.88.220506

©2013 American Physical Society

Authors & Affiliations

J. T. Peltonen1,*, O. V. Astafiev1,2,3,†, Yu. P. Korneeva4, B. M. Voronov4, A. A. Korneev4,5,6, I. M. Charaev4, A. V. Semenov4, G. N. Golt'sman4,6, L. B. Ioffe7, T. M. Klapwijk4,8, and J. S. Tsai1,2

  • 1RIKEN Center for Emergent Matter Science, Tsukuba, Ibaraki 305-8501, Japan
  • 2NEC Smart Energy Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan
  • 3Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom
  • 4Department of Physics and IT, Moscow State Pedagogical University, Moscow 119992, Russia
  • 5Moscow Institute of Physics and Technology, 141700, Dolgoprudny, Moscow Region, Russia
  • 6National Research University Higher School of Economics, Moscow 101000, Russia
  • 7Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, New Jersey 08854, USA
  • 8Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

  • *joonas.peltonen@riken.jp
  • Oleg.Astafiev@rhul.ac.uk

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Issue

Vol. 88, Iss. 22 — 1 December 2013

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