Abstract
We measured the interfacial friction of 3He films adsorbed on Grafoil (exfoliated graphite) using the quartz-crystal microbalance (QCM) technique, and compare present results with those of 4He films. In the same manner as 4He films, the friction decreases below a certain temperature T S , and T S depends on the areal density of 3He film. In two-atom and three-atom thick films, however, T S of 3He films is lower than that of 4He films. Furthermore, the decrease in the friction still remains above five-atom thick films of 3He while it disappears in four-atom thick films of 4He and the superfluid onset is manifest.
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