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  • Articles: DFG German National Licenses  (2)
  • 1990-1994  (2)
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  • Articles: DFG German National Licenses  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Influence of a thin adhesion layer on the damping of surface acoustic waves (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 156-158 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The attenuation of surface acoustic waves (SAWs) on YZ-LiNbO3 crystals, coated with an aluminum layer of several hundred angstroms, has been measured as a function of temperature in the range from 0.3 K to room temperature. A peak in attenuation was found between 50 and 250 K dependent on layer thickness and SAW frequency. Addition of an adhesion layer with a thickness of about 15 A(ring), placed between substrate material and metal coating, drastically lowers the attenuation at higher temperatures. In this case, the attenuation rises slowly with temperature and no peak occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108203
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Low temperature ultrasonic properties of vapour condensed films of argon-xenon mixtures (1992)
    Springer
    The European physical journal 86 (1992), S. 217-223 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using surface acoustic waves we have studied the elastic properties of thin solid films of pure Argon and Xenon and of Ar−Xe mixtures condensed at 4.4 K. From our results we conclude that in all samples low energy excitations are present. They give rise to a relaxation absorption and to related changes of the sound velocity. An important difference to conventional glasses is, that even below Helium temperatures relaxation occurs not only via tunneling but also via thermally activated processes. The density of states of the low energy excitations is comparable to that of vitreous silica and increases continually with Xenon concentration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313828
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    Paper (German National Licenses)
    Fulltext
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