Unexpected effect of internal degrees of freedom on transverse phonons in supercooled liquids
| Autor: | H. Kriegs, Adam Patkowski, A. Le Grand, G. Meier, C. Dreyfus, Jacek Gapiński |
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| Přispěvatelé: | Institute of Physics, A. Mickiewicz University Umultowska, University Umultowska, Institut für Festkörperforschung, Forschungszentrum Jülich Postfach, Institut de minéralogie et de physique des milieux condensés (IMPMC), Université Pierre et Marie Curie - Paris 6 (UPMC)-Université Paris Diderot - Paris 7 (UPD7)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS), Institute of Physics, Adam Mickiewicz University in Poznań (UAM), Institut fur Festkorperforschung, Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Université Pierre et Marie Curie - Paris 6 (UPMC)-IPG PARIS-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Phonon
Degrees of freedom (physics and chemistry) PACS 78.35.+c - 64.70.Pf - 62.50.+p FOS: Physical sciences General Physics and Astronomy Condensed Matter - Soft Condensed Matter Glass transitions 01 natural sciences 0103 physical sciences High-pressure and shock wave effects in solids and liquids ddc:530 [PHYS.COND.CM-DS-NN]Physics [physics]/Condensed Matter [cond-mat]/Disordered Systems and Neural Networks [cond-mat.dis-nn] 010306 general physics Supercooling Physics Brillouin and Rayleigh scattering 010304 chemical physics Condensed matter physics other light scattering Volume viscosity Brillouin zone Coupling (physics) Transverse plane Soft Condensed Matter (cond-mat.soft) Relaxation (physics) Viscosity of liquids dffusive momentum transport |
| Zdroj: | EPL-Europhysics Letters EPL-Europhysics Letters, 2006, 73, pp.607-613. ⟨10.1209/epl/i2005-10429-y⟩ EPL-Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2006, 73, pp.607-613. ⟨10.1209/epl/i2005-10429-y⟩ epl 73, 607-613 (2006). doi:10.1209/epl/i2005-10429-y |
| ISSN: | 0295-5075 1286-4854 |
| DOI: | 10.1209/epl/i2005-10429-y⟩ |
| Popis: | We show experimentally that in a supercooled liquid composed of molecules with internal degrees of freedom the internal modes contribute to the frequency dependent shear viscosity and damping of transverse phonons, which results in an additional broadening of the transverse Brillouin lines. Earlier, only the effect of internal modes on the frequency dependent bulk viscosity and damping of longitudinal phonons was observed and explained theoretically in the limit of weak coupling of internal degrees of freedom to translational motion. A new theory is needed to describe this new effect. We also demonstrate, that the contributions of structural relaxation and internal processes to the width of the Brillouin lines can be separated by measurements under high pressure. |
| Databáze: | OpenAIRE |
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