The Excess Wing in the Dielectric Loss of Glass-Formers: A Johari-Goldstein beta-Relaxation?

Details The Excess Wing in the Dielectric Loss of Glass-Formers: A Johari-Goldstein beta-Relaxation? The Excess Wing in the Dielectric Loss of Glass-Formers: A Johari-Goldstein beta-Relaxation?

2000-01-05

arxiv.org/abs/cond-mat/0001055v2

Phys. Rev. Lett. 84, 5560 (2000)

Physics

Condensed Matter

Soft Condensed Matter

submitted to Phys. Rev. Lett., 4 figures, revised version after referee reports

Scientific paper

10.1103/PhysRevLett.84.5560

Dielectric loss spectra of glass-forming propylene carbonate and glycerol at temperatures above and below T_g are presented. By performing aging experiments lasting up to five weeks, equilibrium spectra below T_g have been obtained. During aging, the excess wing, showing up as a second power law at high frequencies, develops into a shoulder. The results strongly suggest that the excess wing, observed in a variety of glass formers, is the high-frequency flank of a beta-relaxation.

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