Magnetic-field enhancement of superconductivity in ultranarrow wires

被引：73

作者：

Rogachev, A. ^{[1
]}

Wei, T. -C. ^{[1
]}

Pekker, D. ^{[1
]}

Bollinger, A. T. ^{[1
]}

Goldbart, P. M. ^{[1
]}

Bezryadin, A. ^{[1
]}

机构：

[1] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.97.137001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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.

引用

页数：4

共 25 条

[1] Quantum suppression of superconductivity in ultrathin nanowires [J].