Liquefaction of second-layer 4He films on graphite
Liquefaction of second-layer 4He films on graphite
复制标题
石墨上第二层 4He 薄膜的液化
DOI：
10.1103/physrevb.17.151
复制
发表时间：
1978
影响因子：
3.7
通讯作者：
M. Bretz
中科院分区：
文献类型：
--
作者：
S. E. Polanco;M. Bretz
We present the heat capacity of partial second-layer He 4 films adsorbed on Grafoil below 2 K. The second-layer liquefaction temperature occurs near 0.75 K which is substantially less than the 1.3 K observed for monolayer liquefaction. This rescaling in T is thought to result from a vertical spread in the wave functions and hence a reduced Van der Waals interaction between adsorbed helium atoms. A consistent picture emerges when the total heat-capacity signals are modified by compressible-monolayer and film-heterogeneity considerations. The resulting liquefaction phase diagram clearly indicates a critical point near 0.025/Å 2 and some altered higher-coverage behavior.
