Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2007-07-18
Phys. Rev. E 76, 030502(R) (2007)
Physics
Condensed Matter
Disordered Systems and Neural Networks
4 pages, 3 figures; second version as published; small changes of text according to referee suggestions; title changed accordi
Scientific paper
10.1103/PhysRevE.76.030502
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.
Loidl Alois
Lunkenheimer P.
Pardo Luis Carlos
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