Magnetic field enhancement of superconductivity in ultra-narrow wires

Abstract

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.

4 pages, 3 figures, 1 table

References in corpus (12)

• Quantum suppression of superconductivity in ultrathin nanowires
• Reply to the Comment on 'Quantum Phase Slips and Transport in Ultra-Thin Superconducting Wires'
• Superconducting properties of polycrystalline Nb nanowires templated by carbon nanotubes
• Suppression of superconductivity in nanowires by bulk superconductors
• Influence of high magnetic fields on superconducting transition of one-dimensional Nb and MoGe nanowires
• Dephasing by extremely dilute magnetic impurities revealed by Aharonov-Bohm oscillations
• The effect of morphology on the superconductor-insulator transition in 1-D nanowires
• Conductance of Mesoscopic Systems with Magnetic Impurities
• Phase slips in superconducting films with constrictions
• Stabilizing Superconductivity in Nanowires by Coupling to Dissipative Environments
• Enhancement of Superconductivity in Disordered Films by Parallel Magnetic Field
• Enhancing superconductivity: Magnetic impurities and their quenching by magnetic fields

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