Pinning of a nanometric size vortex in superfluid 4He

被引：2
|
作者：
Varoquaux, É [1 ]
Avenel, O
Hakonen, P
Mukharsky, Y
机构：
[1] Univ Paris 11, CNRS, Phys Solides Lab, F-91405 Orsay, France
[2] Ctr Etud Saclay, Serv Phys Etat Condense, CEA, DRECAM, F-91191 Gif Sur Yvette, France
[3] Helsinki Univ Technol, Low Temp Lab, FIN-02015 Espoo, Finland
来源：
PHYSICA B | 2000年 / 284卷
关键词：
critical velocity; pinning; vortex nucleation;
D O I：
10.1016/S0921-4526(99)02051-7
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The incidental observation of a second, lower critical velocity in the flow of superfluid He-4 through a micro-aperture contaminated with micro-particles is interpreted as due to a vortex becoming pinned in the immediate vicinity of the nucleation site for phase-slips. The micro-particles are atomic clusters of solid hydrogen or air of nanometric size, located within nanometres of the nucleation site. The pinned vortex influence is also seen on the scatter of the critical transition which is found to be twice its usual value. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：87 / 88
页数：2
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