Decoupling of 3He Films Adsorbed on Two-Dimensional Mesoporous Hectorite

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The mechanical responses of physisorbed films to the vibration of a substrate were investigated by measuring the sound velocity and attenuation of a two-dimensional mesoporous hectorite. The sound velocity of a pellet with adsorbed 3He films increased drastically at low temperatures accompanied by the attenuation. The temperature dependence of the sound velocity and attenuation can be described by the thermally activated relaxation process, and the increase in sound velocity was found to be proportional to the amount of adsorbed 3He. The most plausible explanation for this behavior is that 3He films decouple from the vibrating substrate at low temperatures.

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