Local superfluid densities probed via current-induced superconducting phase gradients

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

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Article number220506
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number22
StatePublished - Dec 13 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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