TY - JOUR
T1 - Fast relaxation in disordered systems
T2 - From a double well to a cage
AU - Sokolov, Alexei
AU - Novikov, Vladimir
PY - 2004
Y1 - 2004
N2 - An overview of light scattering data measured in broad frequency (0.5GHz<ν<10THz) and temperature (10Kg) ranges are presented for a number of glass-forming systems. The data are compared with two basic approaches: the model of asymmetric double-well potentials (ADWPs) and the mode-coupling theory. It is shown that the ADWP model provides a reasonable description of the data at low temperatures, much below the glass transition temperature Tg. It fails, however, at higher temperatures. Two possible explanations are discussed: firstly, the appearance of a new relaxation process with a near-constant-loss spectral shape and, secondly, an increase in coupling between different relaxation modes with temperature increase.
AB - An overview of light scattering data measured in broad frequency (0.5GHz<ν<10THz) and temperature (10Kg) ranges are presented for a number of glass-forming systems. The data are compared with two basic approaches: the model of asymmetric double-well potentials (ADWPs) and the mode-coupling theory. It is shown that the ADWP model provides a reasonable description of the data at low temperatures, much below the glass transition temperature Tg. It fails, however, at higher temperatures. Two possible explanations are discussed: firstly, the appearance of a new relaxation process with a near-constant-loss spectral shape and, secondly, an increase in coupling between different relaxation modes with temperature increase.
UR - http://www.scopus.com/inward/record.url?scp=2442598367&partnerID=8YFLogxK
U2 - 10.1080/14786430310001644099
DO - 10.1080/14786430310001644099
M3 - Article
AN - SCOPUS:2442598367
SN - 1478-6435
VL - 84
SP - 1355
EP - 1360
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 13-16
ER -