Local superfluid densities probed via current-induced superconducting phase gradients

Hopkins  DS; Pekker  D; Wei  TCGoldbart  PMBezryadin  A

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Local superfluid densities probed via current-induced superconducting phase gradients

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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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《Physical review, B. Condensed matter and materials physics》 |2007年第22期|220506-1-220506-4-0|共4页
作者
Hopkins DS; Pekker D; Wei TCGoldbart PMBezryadin A;
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作者单位

Univ Illinois, Dept Phys, Urbana, IL 61801 USA;

Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA;

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正文语种英语
中图分类固体物理学;
关键词
QUANTUM INTERFERENCE DEVICE; FLUCTUATIONS; WIRES; VORTICES; FIELDS; FILMS; LIMIT;

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Local superfluid densities probed via current-induced superconducting phase gradients

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