Physics – Condensed Matter – Statistical Mechanics
Scientific paper
1998-12-07
p. 441 in AIP Conference Proceeding Vol 469 (AIP, Woodbury, 1999)
Physics
Condensed Matter
Statistical Mechanics
Invited talk given at 8th Tohwa University International Symposium on "Slow Dynamics in Complex Systems", Fukuoka Nov. 1998; 1
Scientific paper
10.1063/1.58528
Using a large scale molecular dynamics computer simulation we investigate the dynamics of a supercooled melt of SiO_2. We find that with increasing temperature the temperature dependence of the diffusion constants crosses over from an Arrhenius-law, with activation energies close to the experimental values, to a power-law dependence. We show that this crossover is related to the fact that at low temperatures the dynamics of the ions is dominated by hopping processes, whereas at high temperatures it shows the continuous flow-like motion proposed by the ideal version of mode-coupling theory (MCT). Finally we show that at low temperatures the dynamics of the system in the beta-relaxation regime obeys the factorization property, in agreement with MCT.
Binder Kurt
Horbach Jurgen
Kob Walter
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