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Brillouin Scattering Study of Propylene Carbonate: An Evaluation of Phenomenological and Mode Coupling Analyses

Brillouin scattering spectra of the molecular glassformer propylene carbonate (PC) in the temperature range 140 K to 350 K were analyzed using both the phenomenological Cole-Davidson memory function and a hybrid memory function consisting of the Cole-Davidson function plus a power-law term representing the critical decay part of the fast beta relaxation. The spectra were also analyzed using the extended two-correlator schematic MCT model recently employed by Gotze and Voigtmann to analyze depolarized light backscattering,dielectric, and neutron-scattering spectra of PC [W.Gotze and Th. Voigtman, Phys. Rev. E61, 4133 (2000). We assess the ability of the phenomenological and MCT fits, each with three free fitting parameters, to simultaneously describe the spectra and give reasonable values for the alpha-relaxation time tau-alpha

preprint2001arXivOpen access
Alexander BrodinMartin FrankSabine WiebelGuoqing ShenJoachim WuttkeH. Z. Cummins
cond-mat.stat-mechcond-mat.soft
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Alexander BrodinMartin FrankSabine WiebelGuoqing ShenJoachim WuttkeH. Z. Cummins

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