Abstract
At low temperatures, the interaction between thermal phonons and low-energy modes typical of glasses is investigated in the range ℏ ω≃ K B T. The attenuation of 33 GHz hypersounds is lower than 500 dB.cm −1 below 5 K. A maximum of velocity is observed. The logarithmic increase of the velocity gives evidence of a resonant interaction up to 6K, and can be explained on the basis of the model assuming a coupling between phonons and two-level systems in glasses.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.