Magnetic field dependence of quasiparticle losses in a superconductor

被引：26

作者：

Ullom, JN ^{[1
]}

Fisher, PA ^{[1
]}

Nahum, M ^{[1
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

来源：

APPLIED PHYSICS LETTERS | 1998年 / 73卷 / 17期

关键词：

D O I：

10.1063/1.122493

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have studied the propagation of quasiparticles in a superconducting film which is penetrated by a magnetic field. We inject quasiparticles into an Al film at 75 mK using a normal-insulator-superconductor tunnel junction and measure the flux of quasiparticles which diffuse into an adjoining thermal detector. A magnetic field applied perpendicular to the plane of the film produces regions of reduced energy gap which trap quasiparticles. We find a significant reduction in the quasiparticle flux for fields as small as 2 G and explain our measurements with a model that incorporates inelastic scattering rates in Al and the characteristics of field penetration. (C) 1998 American Institute of Physics. [S0003-6951(98)02443-7].

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页码：2494 / 2496

页数：3

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