Dynamic Slowing-Down and Nonexponential Decay of the Density Correlation Function in Soft-Sphere Supercooled Liquids

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概要

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• Molecular dynamics simulations were carried out for supercooled soft-sphere li-quids. The computed density correlation function shows a clear nonexponentialdecay in intermediate times, as the liquid-glass transition is approached. The overalltime dependence of the correlation function can be fitted by a stretched function ofthe type: exp [ -(t/t.)'J, where the exponent cr varies from 1, in stable liquids, downto about 0.5, in the vicinity of the liquid-glass transition. The average correlation time<I>=(1/Cll?)G(1/(Y)/. (G(,x') being the gamma function) can be reasonably fitted by ascaling law of the type:<(7')cc(f. -T) ', where T is a coupling constant, the suffix gdenotes the glass transition, and the exponent 0 varies from about 2 to 5, dependingon wave number k. The wave number dependence of the correlation function is dis-cussed.

• 社団法人日本物理学会の論文
• 1987-08-15

著者

• Hiwatari Yasuaki

  Department Of Computational Science Kanazawa University

• KAMBAYASHI Shaw

  Department of Physics,Faculty of Science,Kanazawa University

• Kambayashi Shaw

  Department Of Physics Faculty Of Science Kanazawa University:japan Atomic Energy Research Institute

• Hiwatari Yasuaki

  Department Of Computational Science Faculty Of Science Kanazawa University

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