Application of surface acoustic waves to direct measurement of the parameters of superfluid helium thin films

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Abstract
The authors propose an acoustic method to measure directly the density of the normal component in thin films of superfluid helium. The effect of the helium film on the velocity and the penetration depth of Love and Gulyaev-Bleustein shear surface waves is analysed. The advantage of the method based on the application of shear surface waves is that the change in their velocity, as is shown, is proportional to the normal component density and the helium film thickness.