Abstract
The attenuation of longitudinal hypersonic waves (8.4–10.0 GHz) in thin polycrystalline silver films has been measured in the temperature range from 4 to 26 ‡K. The silver films with thicknesses between 0.2 and 3.0 Μ. were evaporated on the optically flat polished end surface of a cylindrical quartz transducer. The measured value of the attenuation coefficient α=1.5·104 dB cm−1 is much higher than the theoretically predicted value due to electron-phonon interaction. Furthermore the measured value α is independent of temperature and increases with the square of frequency. Presumably this attenuation of hypersonic waves in polycrystalline silver films is due to scattering processes at lattice defects.
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Herrn Professor Dr. H.Raether danke ich für die Anregung und sein förderndes Interesse an dieser Arbeit. Herrn Privatdozent Dr. M.Horstmann danke ich für viele wertvolle Hinweise und Diskussionen.
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Splitt, G. Dämpfung von Hyperschall in dünnen Silberschichten bei 9 GHz. Z. Physik 225, 60–68 (1969). https://doi.org/10.1007/BF01392555
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DOI: https://doi.org/10.1007/BF01392555