Abstract
Velocity and absorption of longitudinal 18 GHz phonons in polymethylmethacrylate and polycarbonate have been measured by Brillouin scattering between 0.3 K and 15 K. At the lowest temperature the velocity of both polymers decreases with decreasing temperature. Upon cooling the absorption decreases linearly with temperature down to 2 K in both polymers. Below that temperature the absorption in polymethyl methacrylate rises again but levels off in polycarbonate. The observation can be described by the interaction between phonons and tunneling states present in the amorphous materials.
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The samples of PMMA and polycarbonate were kindly supplied by Dr. J. Wendorff, Deutsches Kunststoffinstitut, Darmstadt, and Dr. Stamm, Institut für Festkörperforschung, Jülich FKG. Our PMMA sample was already used in experiments reported in reference 8.
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Such a conclusion is supported by the fact that differences in the macroscopic configuration of the polymers do not play an important role; measurements on PS9 have demonstrated that changes in the molecular weight from 22,000 to 200,000 only result in a variation of Pγ2 of about 10 %
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© 1981 Plenum Press, New York
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Vacher, R., Pelous, J., Sussner, H., Schmidt, M., Hunklinger, S. (1981). Brillouin Scattering Down to 0.3 K in Polymers. In: Devreese, J.T., Lemmens, L.F., Van Doren, V.E., Van Royen, J. (eds) Recent Developments in Condensed Matter Physics. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-1086-0_28
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DOI: https://doi.org/10.1007/978-1-4684-1086-0_28
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