Experiments on a High Quality Grid Oscillating in Superfluid 4He at Very Low Temperatures
Experiments on a High Quality Grid Oscillating in Superfluid 4He at Very Low Temperatures
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极低温超流体 4He 中高质量栅极振荡实验
DOI：
10.1007/s10909-009-9992-x
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发表时间：
2009
影响因子：
2
通讯作者：
Efimov V
中科院分区：
文献类型：
--
作者：
Efimov V
本文研究了温度10<T<1500 mK，压力P =5 bar时，超流~ 4 He中的铜网栅在（0，1）Bessel基模下的振荡。振荡器的高品质因子（Q 105）使我们能够观察到其对周期驱动响应的新特征，在最低T时，发现该特征取决于氦的史前史。实验证实了两个临界速度的存在，并讨论了这两个临界速度是否与量子化涡旋有关。
We have investigated a copper-mesh grid oscillating at its fundamental (0, 1) Bessel mode in superfluid4He for temperatures 10<T<1500 mK at a pressure ofP=5 bar. The high quality factor (Q∼105) of the oscillator allowed us to observe new features of its response to a periodic drive which, at the lowestT, was found to depend on the prehistory of the helium. The experiments have confirmed the existence of two critical velocities, and we discuss whether these critical velocities are associated with quantized vortices.