Torsional Oscillator Measurements of Liquid 4He Confined in 2.5-nm Channel of FSM
Torsional Oscillator Measurements of Liquid 4He Confined in 2.5-nm Channel of FSM
复制标题
限制在 FSM 2.5 nm 通道中的液体 4He 的扭转振荡器测量
DOI：
10.1088/1742-6596/969/1/012005
复制
发表时间：
2018
期刊：
影响因子：
--
通讯作者：
M. Suzuki
中科院分区：
文献类型：
--
作者：
K. Taniguchi;J. Taniguchi;M. Suzuki
利用扭转振荡器测量了2.5 nm通道中液体4He在低压下的超流响应，以阐明超流体响应随通道直径的减小而变化的规律。在以前的测量中，在2.8 nm通道中，在0.13 Mpa下，超流体分数在1.8K出现，然后在0.9K出现急剧上升。另一方面，在2.2 nm通道中，虽然出现了超流体分数，但没有观察到急剧上升。在目前对2.5 nm通道的测量中，超流体在1.5K左右出现，然后在0.13K出现急剧上升。相比之下，随着通道直径的减小，超流体出现的温度受到抑制，并伴随着温和的加速，这归因于抑制了进入类BEC状态。相反，通过将通道直径从2.8 nm减小到2.5 nm，超流体中的上升温度比超流体的出现温度得到了显著的抑制。
We measured the superfluid response of liquid 4 He confined in 2.5-nm channel under low pressure by means of the torsional oscillator to clarify how the superfluid response varies with decreasing channel diameter. In the previous measurements, in the 2.8-nm channel under 0.13 MPa, the superfluid fraction appears at 1.8 K, and then shows a sharp rise at 0.9 K. On the other hand, in the 2.2-nm channel, no sharp rise is observed although the superfluid fraction appears. In the present measurements for 2.5-nm channel, the superfluid appears at around 1.5 K, and then shows a sharp rise at 0.13 K. By comparison, with decreasing channel diameter, the temperature of superfluid appearance is suppressed with gentle acceleration, which is attributable to the suppression of falling into a BEC-like state. In contrast, the temperature of the rise in the superfluid is suppressed drastically compared with that of superfluid appearance, by decreasing the channel diameter from 2.8 to 2.5 nm.