SCALING BEHAVIOR IN THE BETA-RELAXATION REGIME OF A SUPERCOOLED LENNARD-JONES MIXTURE
SCALING BEHAVIOR IN THE BETA-RELAXATION REGIME OF A SUPERCOOLED LENNARD-JONES MIXTURE
复制标题
DOI：
10.1103/physrevlett.73.1376
复制
发表时间：
1994-09-05
影响因子：
8.6
通讯作者：
ANDERSEN, HC
中科院分区：
文献类型：
--
作者：
KOB, W;ANDERSEN, HC
我们对过冷原子液体进行了分子动力学模拟。β弛豫区的自中间散射函数具有与von Schweidler定律的模耦合理论预言一致的时间依赖和温度依赖关系，其指数非常接近于满足理论所预言的指数关系。在相同的临界条件下，扩散常数与温度呈幂函数关系。温度。扩散指数与弛豫时间的指数不同，这一结果与理论不符。
We have performed molecular dynamics simulations of a supercooled atomic liquid. The self-intermediate-scattering function in the beta-relaxation regime has a power-law time dependence and temperature dependence consistent with the mode-coupling-theory prediction of a von Schweidler law, with exponents that are very close to satisfying the exponent relationship predicted by the theory. The diffusion constants have a power-law dependence on temperature with the same critical. temperature. The exponents for diffusion differ from those of the relaxation time, a result that is in disagreement with the theory.