Magnetic-Field Enhancement of Superconductivity in Ultranarrow Wires

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A. Rogachev, T.-C. Wei, D. Pekker, A. T. Bollinger, P. M. Goldbart, and A. Bezryadin
Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801-3080, USA

Received 13 April 2006; published 25 September 2006

Westudy the effect of an applied magnetic field on sub-10-nmwide MoGe and Nb superconducting wires. We find that magneticfields can enhance the critical supercurrent at low temperatures, anddo so more strongly for narrower wires. We conjecture thatmagnetic moments are present, but their pair-breaking effect, active atlower magnetic fields, is suppressed by higher fields. The correspondingmicroscopic theory, which we have developed, quantitatively explains all experimentalobservations, and suggests that magnetic moments have formed on thewire surfaces.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.97.137001
DOI:	10.1103/PhysRevLett.97.137001
PACS:	74.78.Na; 74.25.Fy; 74.25.Ha; 74.40.+k 74.78.Na Superconducting mesoscopic and nanoscale systems 74.25.Fy Transport properties of superconductors including electric and thermal conductivity, thermoelectric effects, etc 74.25.Ha Magnetic properties of superconductors 74.40.+k Fluctuations in superconductors including noise, chaos, nonequilibrium superconductivity, localization, etc YEAR: 2006

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