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- Title
Anomalous Attenuation of Piezoacoustic Surface Waves by Liquid Helium Thin Films.
- Authors
Byeon, H.; Nasyedkin, K.; Lane, J. R.; Zhang, L.; Beysengulov, N. R.; Loloee, R.; Pollanen, J.
- Abstract
We report on the observation of an anomalously high attenuation of high-frequency surface acoustic waves by thin films of liquid 4 He. The piezoelectric acoustic waves propagate along the surface of a lithium niobate substrate, which is coated with varying amounts of liquid helium. When the thickness of the helium layer is much larger than the wavelength of the surface acoustic wave on the substrate, its attenuation is dominated by the excitation of compressional waves into the liquid, in good agreement with theory and previous measurements. However, for sufficiently thin helium coverage, we find that the acoustic wave attenuation is significantly increased beyond that measured with the substrate submerged in bulk liquid. Possible mechanisms for this enhanced attenuation are discussed.
- Subjects
SURFACE waves (Fluids); LIQUID helium; THIN films; ACOUSTIC surface waves; SOUND-wave attenuation; LITHIUM niobate
- Publication
Journal of Low Temperature Physics, 2019, Vol 195, Issue 3/4, p336
- ISSN
0022-2291
- Publication type
Article
- DOI
10.1007/s10909-018-02115-0