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Local superfluid densities probed via current-induced superconducting phase gradients

David S. Hopkins, David Pekker, Tzu-Chieh Wei, Paul M. Goldbart, and Alexey Bezryadin
Phys. Rev. B 76, 220506(R) – Published 13 December 2007

Abstract

We have developed a superconducting phase gradiometer consisting of two parallel DNA-templated nanowires connecting two thin-film leads. We have ramped the cross current flowing perpendicular to the nanowires, and observed oscillations in the lead-to-lead resistance due to cross-current-induced phase differences. By using this gradiometer we have measured the temperature- and magnetic-field dependence of the superfluid density, and observed an amplification of phase gradients caused by elastic vortex displacements. We examine our data in light of Miller-Bardeen theory of dirty superconductors and a microscale version of Campbell’s model of field penetration.

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  • Received 26 September 2007

DOI:https://doi.org/10.1103/PhysRevB.76.220506

©2007 American Physical Society

Authors & Affiliations

David S. Hopkins, David Pekker, Tzu-Chieh Wei, Paul M. Goldbart, and Alexey Bezryadin

  • Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA

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Issue

Vol. 76, Iss. 22 — 1 December 2007

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