Magnetic-field-induced stabilization of nonequilibrium superconductivity in a normal-metal/insulator/superconductor junction

被引：29
|
作者：
Peltonen, J. T. [1 ]
Muhonen, J. T. [1 ,2 ]
Meschke, M. [1 ]
Kopnin, N. B. [1 ,3 ]
Pekola, J. P. [1 ]
机构：
[1] Aalto Univ, Low Temp Lab, FI-00076 Aalto, Finland
[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England
[3] LD Landau Theoret Phys Inst, Moscow 117940, Russia
来源：
PHYSICAL REVIEW B | 2011年 / 84卷 / 22期
基金：
芬兰科学院; 英国工程与自然科学研究理事会;
关键词：
QUASI-PARTICLE; REFRIGERATION; LIFETIMES;
D O I：
10.1103/PhysRevB.84.220502
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A small magnetic field is found to enhance relaxation processes in a superconductor, thus stabilizing superconductivity in nonequilibrium conditions. In a normal-metal (N)/insulator/superconductor (S) tunnel junction, applying a field of the order of 100 mu T leads to significantly improved cooling of the N island by quasiparticle (QP) tunneling. These findings are attributed to faster QP relaxation within the S electrodes as a result of enhanced QP drain through regions with a locally suppressed energy gap due to magnetic vortices in the S leads at some distance from the junction.
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页数：4
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