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. 2006 Sep 29;97(13):137001.
doi: 10.1103/PhysRevLett.97.137001. Epub 2006 Sep 25.

Magnetic-field enhancement of superconductivity in ultranarrow wires

A Rogachev  1 , T-C Wei, D Pekker, A T Bollinger, P M Goldbart, A Bezryadin
Affiliations

Magnetic-field enhancement of superconductivity in ultranarrow wires

A Rogachev et al. Phys Rev Lett. .

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.

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