TY - JOUR
T1 - Molecular dynamics study of a supercooled binary soft-sphere system
T2 - Calculation of the generalized susceptibility in supercooled and glassy states
AU - Fujisaki, Morio
AU - Matsui, Jun
AU - Odagaki, Takashi
PY - 1997/1/1
Y1 - 1997/1/1
N2 - To study how the motion of atoms changes through a glass forming process, we have carried out the molecular dynamics simulation for a binary soft-sphere system and calculated the self-part of the generalized susceptibility χs(q,ω) at various temperatures above/below Tg. At higher temperature, only one peak appears in the imaginary part of χs, which corresponds to random motion of atoms in the liquid state. When the temperature is reduced, the α-peak tends to separate out from the main peak and to move to lower frequencies. At the lowest temperature, the peak disappears from our frequency window. We show that the temperature dependence of the peak frequency is well described by the Vogel-Fulcher low. We also test the mode coupling theory. The two exponents do not agree with the universality of the mode coupling theory, λ = Γ(1 - a)2/Γ(1 + 2b) =const.
AB - To study how the motion of atoms changes through a glass forming process, we have carried out the molecular dynamics simulation for a binary soft-sphere system and calculated the self-part of the generalized susceptibility χs(q,ω) at various temperatures above/below Tg. At higher temperature, only one peak appears in the imaginary part of χs, which corresponds to random motion of atoms in the liquid state. When the temperature is reduced, the α-peak tends to separate out from the main peak and to move to lower frequencies. At the lowest temperature, the peak disappears from our frequency window. We show that the temperature dependence of the peak frequency is well described by the Vogel-Fulcher low. We also test the mode coupling theory. The two exponents do not agree with the universality of the mode coupling theory, λ = Γ(1 - a)2/Γ(1 + 2b) =const.
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U2 - 10.1143/PTPS.126.317
DO - 10.1143/PTPS.126.317
M3 - Article
AN - SCOPUS:0031500666
SP - 317
EP - 320
JO - Progress of Theoretical Physics
JF - Progress of Theoretical Physics
SN - 0033-068X
IS - 126
ER -