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Dielectric spectroscopy in benzophenone: Is the mode-coupling Cole-Cole peak a canonical beta relaxation? | | L.C. Pardo
; P. Lunkenheimer
; A. Loidl
; | | Date: |
18 Jul 2007 | | Abstract: | We report a thorough characterization of the glassy dynamics of benzophenone
by broadband dielectric spectroscopy. We detect a well pronounced beta
relaxation peak developing into an excess wing with increasing temperature. A
previous analysis of results from Optical-Kerr-effect measurements on this
material within the mode coupling theory revealed a high-frequency Cole-Cole
peak. We address the question if this phenomenon also may explain the
Johari-Goldstein beta relaxation, a so far unexplained spectral feature
inherent to glass-forming matter, mainly observed in dielectric spectra. Our
results demonstrate that according to the present status of theory, both
spectral features seem not to be directly related. | | Source: | arXiv, 0707.2800 | | Services: | Forum | Review | PDF | Favorites | |
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