Magnetic field enhancement of superconductivity in ultra-narrow wires

Details Magnetic field enhancement of superconductivity in ultra-narrow wires Magnetic field enhancement of superconductivity in ultra-narrow wires

2006-04-13

arxiv.org/abs/cond-mat/0604351v1

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, 1 table

Scientific paper

10.1103/PhysRevLett.97.137001

We study the effect of an applied magnetic field on sub-10nm wide MoGe and Nb superconducting wires. We find that magnetic fields can enhance the critical supercurrent at low temperatures, and does 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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