Local superfluid densities probed via current-induced superconducting phase gradients

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

doi:10.1103/PhysRevB.76.220506

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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, Alexey Bezryadin

DOI 10.1103/PhysRevB.76.220506 · Physical Review B

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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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.22	Pressure not reported	unknown
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.94	Pressure not reported	unknown
Mo79Ge21 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.56	Pressure not reported	unknown