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Vortex jets generated by edge defects in current-carrying superconductor thin strips

A. I. Bezuglyj, V. A. Shklovskij, B. Budinská, B. Aichner, V. M. Bevz, M. Yu. Mikhailov, D. Yu. Vodolazov, W. Lang, and O. V. Dobrovolskiy
Phys. Rev. B 105, 214507 – Published 8 June 2022
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Abstract

At sufficiently large transport currents Itr, a defect at the edge of a superconducting strip acts as a gate for the vortices entering into it. These vortices form a jet, which is narrow near the defect and expands due to the repulsion of vortices as they move to the opposite edge of the strip, giving rise to a transverse voltage V. Here, relying upon the equation of vortex motion under competing vortex-vortex and Itr-vortex interactions, we derive the vortex jet shapes in narrow (ξwλeff) and wide (wλeff) strips [ξ: coherence length, w: strip width, λeff: effective penetration depth]. We predict a nonmonotonic dependence V(Itr) which can be measured with Hall voltage leads placed on the line V1V2 at a small distance l apart from the edge defect and which changes its sign upon ll reversal. For narrow strips, we compare the theoretical predictions with experiment, by fitting the V(Itr,l) data for 1μm-wide MoSi strips with single edge defects milled by a focused ion beam at distances l=1680 nm from the line V1V2. For wide strips, the derived magnetic field dependence of the vortex jet shape is in line with the recent experimental observations for vortices moving in Pb bridges with a narrowing. Our findings are augmented with the time-dependent Ginzburg-Landau simulations which reproduce the calculated vortex jet shapes and the V(Itr,l) maxima. Furthermore, with increase of Itr, the numerical modeling unveils the evolution of vortex jets to vortex rivers, complementing the analytical theory in the entire range of Itr.

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  • Received 14 February 2022
  • Revised 13 April 2022
  • Accepted 14 April 2022

DOI:https://doi.org/10.1103/PhysRevB.105.214507

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

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Vortex Jets Spotted in Superconductors

Published 8 June 2022

Researchers have identified and studied vortex jets—streams of swirling electrons—that can form at edge defects in current-carrying superconductors.

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Authors & Affiliations

A. I. Bezuglyj1, V. A. Shklovskij2, B. Budinská3,4, B. Aichner3,4, V. M. Bevz2, M. Yu. Mikhailov5, D. Yu. Vodolazov6, W. Lang3, and O. V. Dobrovolskiy3,*

  • 1Institute for Theoretical Physics, NSC-KIPT, 61108 Kharkiv, Ukraine
  • 2Physics Department, V. Karazin Kharkiv National University, 61022, Kharkiv, Ukraine
  • 3University of Vienna, Faculty of Physics, 1090 Vienna, Austria
  • 4University of Vienna, Vienna Doctoral School in Physics, 1090 Vienna, Austria
  • 5B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 61103, Kharkiv, Ukraine
  • 6Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod region 603087, Russia

  • *Corresponding author: oleksandr.dobrovolskiy@univie.ac.at

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Issue

Vol. 105, Iss. 21 — 1 June 2022

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