Superfluidity and film structure in 4He adsorbed on graphite.
Superfluidity and film structure in 4He adsorbed on graphite.
复制标题
石墨吸附4He的超流性和薄膜结构。
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
J. Reppy
中科院分区：
文献类型：
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作者：
P. Crowell;J. Reppy
我们完成了吸附在石墨基面上的超流性薄膜的扭转振子研究，覆盖范围从11/2到7个原子层。与吸附在非晶态衬底上的薄膜的超流性相比，我们发现了几种不同的超流行为。第二层中的超流性表现出反常的温度依赖性，并被薄膜的固化所破坏。由于第三层覆盖率较低，超流膜似乎与二维表面气体共存。相变的证据，可能是底层的重建，出现在第三层完成的正上方。通过第六层的完成，可以看到具有覆盖的超流体信号的调制。版权所有：1996年美国物理学会。
We have completed a torsional-oscillator study of superfluidity in thin films of $^{4}mathrm{He}$ adsorbed on the basal plane of graphite for coverages from 11/2 to 7 atomic layers. In contrast to superfluidity in films adsorbed on amorphous substrates, we find several different regimes of superfluid behavior. Superfluidity in the second layer shows an anomalous temperature dependence and is destroyed by solidification of the film. The superfluid film appears to coexist with a two-dimensional surface gas for low coverages in the third layer. Evidence of a phase transition, which may be the reconstruction of an underlying layer, appears just above the completion of the third layer. Modulation of the superfluid signal with coverage is seen through the completion of the sixth layer. extcopyright{} 1996 The American Physical Society.