TY - JOUR
T1 - Study of the slow dynamics in a highly supercooled fluid
T2 - Superlong-time molecular-dynamics calculation of the generalized susceptibility
AU - Matsui, J.
AU - Odagaki, T.
AU - Hiwatari, Y.
PY - 1994/1/1
Y1 - 1994/1/1
N2 - Generalized susceptibility χ(q,ω) for binary soft-sphere mixtures is computed for the first time for a frequency range which includes both the α and β peaks in a supercooled fluid phase with a superlongtime (10 × 106 time steps) molecular dynamics simulation. This gives us reliable spectral data in a wide frequency range of over 5 orders of magnitude and at various wave numbers, so that we can discuss without ambiguity the dynamical behavior of both α and β relaxations. The α and β peaks in χ′′(q,ω) are obtained for the first time by molecular dynamics simulation. It is shown that the α peak has a non-Debye-type ω dependence, the β peak is essentially of a Debye type, and a crossover between the α and β peaks manifests itself in the so-called β relaxation.
AB - Generalized susceptibility χ(q,ω) for binary soft-sphere mixtures is computed for the first time for a frequency range which includes both the α and β peaks in a supercooled fluid phase with a superlongtime (10 × 106 time steps) molecular dynamics simulation. This gives us reliable spectral data in a wide frequency range of over 5 orders of magnitude and at various wave numbers, so that we can discuss without ambiguity the dynamical behavior of both α and β relaxations. The α and β peaks in χ′′(q,ω) are obtained for the first time by molecular dynamics simulation. It is shown that the α peak has a non-Debye-type ω dependence, the β peak is essentially of a Debye type, and a crossover between the α and β peaks manifests itself in the so-called β relaxation.
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U2 - 10.1103/PhysRevLett.73.2452
DO - 10.1103/PhysRevLett.73.2452
M3 - Article
AN - SCOPUS:3743131565
VL - 73
SP - 2452
EP - 2455
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 18
ER -