Phys. Rev. Lett. 84, 5560–5563 (2000)Excess Wing in the Dielectric Loss of Glass Formers: A Johari-Goldstein β Relaxation?Received 5 January 2000; published in the issue dated 12 June 2000 Dielectric loss spectra of glass-forming propylene carbonate and glycerol at temperatures above and below Tg are presented. By performing aging experiments lasting up to five weeks, equilibrium spectra below Tg 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 β relaxation. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.5560
DOI:
10.1103/PhysRevLett.84.5560
PACS:
64.70.Pf, 77.22.Gm
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