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Measurement of Critical Currents of Superconducting Aluminum Nanowires in External Magnetic Fields: Evidence for a Weber Blockade

Tyler Morgan-Wall, Benjamin Leith, Nikolaus Hartman, Atikur Rahman, and Nina Marković
Phys. Rev. Lett. 114, 077002 – Published 18 February 2015
Physics logo See Synopsis: Vortices Queue Up in a Nanowire
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Abstract

We have studied the critical current as a function of magnetic field in short and narrow superconducting aluminum nanowires. In the range of magnetic fields in which vortices can enter a nanowire in a single row, we find regular oscillations of the critical current as a function of magnetic field, with each oscillation corresponding to adding a single vortex to the nanowire. In this regime, the nanowires behave as quantum dots for vortices. As a function of current and magnetic field, we find diamond-shaped regions in which the resistance is zero and the number of vortices is fixed.

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  • Received 26 August 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.077002

© 2015 American Physical Society

Synopsis

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Vortices Queue Up in a Nanowire

Published 18 February 2015

An applied field can control the entry and exit of single quanta of magnetic flux in superconducting nanowires.

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Authors & Affiliations

Tyler Morgan-Wall, Benjamin Leith, Nikolaus Hartman, Atikur Rahman, and Nina Marković

  • Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA

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Issue

Vol. 114, Iss. 7 — 20 February 2015

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