Magnetic-field enhancement of superconductivity in ultranarrow wires

A. Rogachev, T. C. Wei, D. Pekker, A. T. Bollinger, P. M. Goldbart, A. Bezryadin

Research output: Contribution to journalArticle

Abstract

We study the effect of an applied magnetic field on sub-10-nm wide MoGe and Nb superconducting wires. We find that magnetic fields can enhance the critical supercurrent at low temperatures, and do so more strongly for narrower wires. We conjecture that magnetic moments are present, but their pair-breaking effect, active at lower magnetic fields, is suppressed by higher fields. The corresponding microscopic theory, which we have developed, quantitatively explains all experimental observations, and suggests that magnetic moments have formed on the wire surfaces.

Original languageEnglish (US)
Article number137001
JournalPhysical review letters
Volume97
Issue number13
DOIs
StatePublished - Oct 2 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Rogachev, A., Wei, T. C., Pekker, D., Bollinger, A. T., Goldbart, P. M., & Bezryadin, A. (2006). Magnetic-field enhancement of superconductivity in ultranarrow wires. Physical review letters, 97(13), [137001]. https://doi.org/10.1103/PhysRevLett.97.137001