Rayleigh-Brillouin light-scattering study of a simple glass former: evidence of locally favored structures.
The Rayleigh-Brillouin light scattering is studied in the glass-forming picoline with emphasis to the temperature dependence of the Landau-Placzek ratio. It was found that the Landau-Placzek ratio is in good agreement with the theoretical prediction at T>T(A), where TA is the temperature of transition from an Arrhenius-like to a non-Arrhenius behavior for the α-relaxation time dependence on temperature. Below T(A) the Landau-Placzek ratio exceeds significantly the theoretical prediction. The finding is interpreted as the evidence of the locally favored structures, which presence in an equilibrium glass-forming liquid below T(A).
Popova
V A
VA
Institute of Automation and Electrometry, Russian Academy of Sciences, Novosibirsk 630090, Russia.
Pugachev
A M
AM
Surovtsev
N V
NV