Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2006-04-26
Physics
Condensed Matter
Disordered Systems and Neural Networks
5 pages, 4 figures
Scientific paper
The temperature evolution of the broadband $10^{-6}$-$10^{10}$ Hz dielectric susceptibility of the paradigmatic glass formers glycerol, propylene carbonate, and fluoro-aniline is analyzed assuming a three-step relaxation due to the $\alpha$-process, its excess wing, and a $\beta$-process. We find that the $\alpha$-peak and the wing can be described by susceptibility functions with temperature-independent high-frequency exponents, while the relative weight of these contributions does depend on the temperature. The excess wing and the $\beta$-process are distinct phenomena; in particular, the relaxation strength of the excess wing grows with decreasing the temperature, contrary to that of the $\beta$-process. In our interpretation, the frequency-temperature superposition of the $\alpha$-process is valid for all temperatures; in the case of glycerol, a typical $\beta$-process is unambiguously identified for the first time.
Brodin Alexander
Gainaru Catalin
Novikov Vladimir
Rössler Ernst A.
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