Abstract
We have studied an effect of 3He on superfluid 4He films adsorbed on exfoliated graphite (Grafoil) using a quartz-crystal microbalance (QCM) technique. It is known that zero-temperature superfluid mass and superfluid onset temperature of 4He films adsorbed on porous gold substrate are suppressed, or even eliminated with the addition of 3He. We found that the superfluid onset temperature of 4He films on graphite decreases with the addition of 3He. However, the superfluid mass does not increase monotonically with decreasing temperature; it has a peak and is suppressed below a certain temperature, which suggests a phase separation of the film at low temperatures.
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