Anomalous Attenuation of Piezoacoustic Surface Waves by Liquid Helium Thin Films
| Autor: | Reza Loloee, K. Nasyedkin, L. Zhang, N. R. Beysengulov, J. R. Lane, H. Byeon, Johannes Pollanen |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
genetic structures FOS: Physical sciences chemistry.chemical_element 01 natural sciences 010305 fluids & plasmas law.invention Physics::Fluid Dynamics law Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences otorhinolaryngologic diseases General Materials Science 010306 general physics Helium Condensed Matter - Mesoscale and Nanoscale Physics Condensed matter physics Liquid helium Attenuation Surface acoustic wave Acoustic wave Condensed Matter Physics Atomic and Molecular Physics and Optics Condensed Matter::Soft Condensed Matter Wavelength chemistry Surface wave sense organs Longitudinal wave |
| Zdroj: | Journal of Low Temperature Physics. 195:336-342 |
| ISSN: | 1573-7357 0022-2291 |
| Popis: | 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. Comment: 8 pages, 4 figures |
| Databáze: | OpenAIRE |
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