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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, 031506. DOI: 10.1103/PhysRevE.84.031506.

Full text not available from this repository.

Abstract

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.

Document Type:Article
Title:Glassy relaxation and excess wing in mode-coupling theory: The dynamic susceptibility of propylene carbonate above and below Tc
Authors:
AuthorsInstitution or Email of Authors
Domschke, M.UNSPECIFIED
Marsilius, M.UNSPECIFIED
Blochowicz, T.UNSPECIFIED
Voigtmann, Th.thomas.voigtmann@dlr.de
Date:30 September 2011
Journal or Publication Title:Physical Review E
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:84
DOI:10.1103/PhysRevE.84.031506
Page Range:031506
Status:Published
Keywords:mode-coupling theory, glassy relaxation spectra
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
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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