Competition between slippage and superfluidity of^4He Films

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In order to clarify the mechanism of the competition between slippage and super fluidity of 4He films, we carried out QCM measurements under different conditions from the previous 5 MHz-QCM experiments. In 32 kHz-QCM experiments, we observed the competition under the condition when the acceleration of oscillating substrate is much the same as the previous experiments. This suggests that the effective force acting on the film plays an important role in sliding solid 4He films, and supports the sliding model which was proposed by Minoguchi.