Author： Wang S. Ketola K.S. Lemaire P. Hallock R.B.
Publisher： Springer Publishing Company
ISSN： 0022-2291
Source： Journal of Low Temperature Physics, Vol.119, Iss.5-6, 2000-06, pp. : 645-675
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Abstract
The amplitude of third sound has been measured as a function of the amplitude and width of a pulsed thermal drive for ^4He film thickness values in the range 3–20 layers at T=1.11, 1.35 and 1.50 K. Saturation of the third sound amplitude and non-linearity were measured for large drive powers. The critical velocity of film flow is estimated from the saturated amplitude.
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