TY - JOUR
T1 - Magnetic-field enhancement of superconductivity in ultranarrow wires
AU - Rogachev, A.
AU - Wei, T. C.
AU - Pekker, D.
AU - Bollinger, A. T.
AU - Goldbart, P. M.
AU - Bezryadin, A.
PY - 2006
Y1 - 2006
N2 - 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.
AB - 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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U2 - 10.1103/PhysRevLett.97.137001
DO - 10.1103/PhysRevLett.97.137001
M3 - Article
AN - SCOPUS:33749027184
SN - 0031-9007
VL - 97
JO - Physical Review Letters
JF - Physical Review Letters
IS - 13
M1 - 137001
ER -