Physics – Condensed Matter
Scientific paper
1994-07-29
Phys. Rev. Lett. 73, 1376 (1994)
Physics
Condensed Matter
8 pages, RevTex, four postscript figures available on request, MZ-Physics-100
Scientific paper
10.1103/PhysRevLett.73.1376
We report the results of a molecular dynamics simulation of a supercooled binary Lennard-Jones mixture. By plotting the self intermediate scattering functions vs. rescaled time, we find a master curve in the $\beta$-relaxation regime. This master curve can be fitted well by a power-law for almost three decades in rescaled time and the scaling time, or relaxation time, has a power-law dependence on temperature. Thus the predictions of mode-coupling-theory on the existence of a von Schweidler law are found to hold for this system; moreover, the exponents in these two power-laws are very close to satisfying the exponent relationship predicted by the mode-coupling-theory. At low temperatures, the diffusion constants also show a power-law behavior with the same critical temperature. However, the exponent for diffusion differs from that of the relaxation time, a result that is in disagreement with the theory.
Andersen Hans C.
Kob Walter
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