Glassy relaxation and excess wing in mode-coupling theory: The dynamic susceptibility of propylene carbonate above and below Tc
Domschke, M. and Marsilius, M. and Blochowicz, T. and Voigtmann, Th. (2011) Glassy relaxation and excess wing in mode-coupling theory: The dynamic susceptibility of propylene carbonate above and below Tc. Physical Review E, 84, . DOI: 10.1103/PhysRevE.84.031506.
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We explore the possibility of describing experimental susceptibility spectra of the glass former propylene carbonate with a two-component schematic model of mode-coupling theory (MCT) from above the melting point down to temperatures far below the critical temperature of MCT. By introducing a phenomenological time-dependent hopping rate, the spectra are reproduced in the full frequency and temperature range available. Literature data of dielectric susceptibilities and depolarized Brillouin light-scattering spectra are combined with our measurements of photon correlation spectroscopy to cover up to 18 decades in frequency of spectra for two different dynamical variables. A consistent description of all data sets is obtained by adjusting only a few physically motivated parameters. In particular the excess wing or slow β-relaxation commonly observed in the susceptibility spectra can consistently be modeled as originating from a coupling of the individual experimental probe correlator to the collective density ﬂuctuations.
|Title:||Glassy relaxation and excess wing in mode-coupling theory: The dynamic susceptibility of propylene carbonate above and below Tc|
|Date:||30 September 2011|
|Journal or Publication Title:||Physical Review E|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Keywords:||mode-coupling theory, glassy relaxation spectra|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Materialwissenschaftliche Forschung (old)|
|Institutes and Institutions:||Institute of Materials Physics in Space|
|Deposited By:||Dr.rer.nat. Thomas Voigtmann|
|Deposited On:||04 Oct 2011 16:16|
|Last Modified:||20 Mar 2013 19:44|
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