Anomalous Damping of a Low Frequency Vibrating Wire in Superfluid 3He-B due to Vortex Shielding
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- 作者：D. I. Bradley (1)
M. J. Fear (1)
S. N. Fisher (1)
A. M. Guénault (1)
R. P. Haley (1)
C. R. Lawson (1)
G. R. Pickett (1)
R. Schanen (1)
V. Tsepelin (1) - 关键词：Vibrating Wire ; Superfluid Helium ; Turbulence ; Vortex Shielding
- 刊名：Journal of Low Temperature Physics
- 出版年：2014
- 出版时间：April 2014
- 年：2014
- 卷：175
- 期：1-2
- 页码：372-378
- 全文大小：431 KB
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M. J. Fear (1)
S. N. Fisher (1)
A. M. Guénault (1)
R. P. Haley (1)
C. R. Lawson (1)
G. R. Pickett (1)
R. Schanen (1)
V. Tsepelin (1)
1. Department of Physics, Lancaster University, Lancaster, United Kingdom - ISSN：1573-7357
文摘
We have investigated the behaviour of a large vibrating wire resonator in the B-phase of superfluid 3He at zero pressure and at temperatures below 200?μK. The vibrating wire has a low resonant frequency of around 60 Hz. At low velocities the motion of the wire is impeded by its intrinsic (vacuum) damping and by the scattering of thermal quasiparticle excitations. At higher velocities we would normally expect the motion to be further damped by the creation of quasiparticles from pair-breaking. However, for a range of temperatures, as we increase the driving force we observe a sudden decrease in the damping of the wire. This results from a reduction in the thermal damping arising from the presence of quantum vortex lines generated by the wire. These vortex lines Andreev-reflect low energy excitations and thus partially shield the wire from incident thermal quasiparticles.