Measuring the superconducting coherence length in thin films using a two-coil experiment

John Draskovic, Thomas R. Lemberger, Brian Peters, Fengyuan Yang, Jaseung Ku, Alexey Bezryadin, Song Wang

Research output: Contribution to journalArticle

Abstract

We present measurements of the superconducting coherence length ξ in thin (d≤100-Å) films of MoGe and Nb using a combination of linear and nonlinear mutual inductance techniques. As the alternating current in the drive coil is increased at a fixed temperature, we see a crossover from linear to nonlinear coupling to the pickup coil, consistent with the unbinding of vortex-antivortex pairs as the peak pair momentum nears â/ξ and the unbinding barrier vanishes. We compare measurements of ξ performed by this mutual inductance technique to values determined from the films' upper critical fields, thereby confirming the applicability of a recent calculation of the upper limit on a vortex-free state in our experiment.

Original languageEnglish (US)
Article number134516
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume88
Issue number13
DOIs
StatePublished - Oct 23 2013

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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