Slippage of nonsuperfluid 3He-4He mixture film on gold
Slippage of nonsuperfluid 3He-4He mixture film on gold
复制标题
非超流体 3He-4He 混合物膜在金上的滑移
DOI：
10.1088/1742-6596/400/1/012017
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
and N. Wada
中科院分区：
文献类型：
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作者：
M. Hieda;T. Oda;T. Matsushita;and N. Wada
我们报告了在平面金衬底上覆盖{sup 3}He-{sup 4}He混合膜（n{sub 3} = 0.75和n{sub 4} = 2.90体积密度层）的100 MHz QCM实验结果。本研究采用恒定振荡速度v从19到59 {mu}m/s对升温和降温进行温度扫描。在最小v = 19 {mu}m/s时，在起始温度T{sub o} 0.16 K以下观测到约5 Hz的超流体转变，而在v = 35 {mu}m/s时，观测到的频率发生了巨大变化，在升温和冷却之间发现了一个超大的频移，并伴有磁滞回线。在进一步增加v时，额外的位移演变成更大的位移。这些观测结果表明，在v = 35 {mu}m/s以上，{sup 3}He在{sup 4}He层上的一部分以钉-脱钉机制滑动。在最大v = 59 {mu}m/s时，滑移解耦率达到整个{sup 3}He种群的90%。
We report the result of a QCM experiment at 100 MHz for a coverage of {sup 3}He-{sup 4}He mixture film (n{sub 3} = 0.75 and n{sub 4} = 2.90 bulk-density layers) on a planar gold substrate. This study is done by taking the temperature scan of both warming and cooling at various constant oscillation velocities v from 19 to 59 {mu}m/s. At minimum v = 19 {mu}m/s, a frequency shift of about 5 Hz due to the superfluid transition is observed below the onset temperature T{sub o} 0.16 K Surprisingly, at v = 35 {mu}m/s, the observation is dramatically changed and an extra large frequency shift with a hysteresis loop between warming and cooling is found. Upon increasing v further, the extra shift evolves into much larger shifts. These observations suggest that a part of {sup 3}He on underlying {sup 4}He layer slips by a pinning-depinning mechanism above v = 35 {mu}m/s. At maximum v = 59 {mu}m/s, the decoupling ratio of slippage reaches 90% of the whole {sup 3}He population.