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Does frequency-temperature superposition hold in deeply super-cooled liquids?

Catalin Gainaru·Alexander Brodin·Vladimir Novikov·Ernst A. Rössler
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Abstract

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 $α$-process, its excess wing, and a $β$-process. We find that the $α$-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 $β$-process are distinct phenomena; in particular, the relaxation strength of the excess wing grows with decreasing the temperature, contrary to that of the $β$-process. In our interpretation, the frequency-temperature superposition of the $α$-process is valid for all temperatures; in the case of glycerol, a typical $β$-process is unambiguously identified for the first time.

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Catalin Gainaru, Alexander Brodin, Vladimir Novikov, Ernst A. Rössler. 2006-04-26. Does frequency-temperature superposition hold in deeply super-cooled liquids?. https://arxiv.org/abs/cond-mat/0604597

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