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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1209.3401cond-mat.softcond-mat.mtrl-sci
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玻璃态甘油老化过程中空间相关性增长的证据

Evidence of growing spatial correlations during the aging of glassy glycerol

C. Brun, F. Ladieu, L'Hôte, G. Biroli, Jean-Philippe Bouchaud

摘要:

我们已经测量了,作为年龄$t_a$的函数,甘油的非线性介电极化率$χ_3$低于玻璃化转变的老化。然而,线性磁化率可以根据年龄依赖性弛豫时间$τ_α(t_a)$准确地解释,这种比例分解为$χ_3$,表明$χ_3$的振幅增加。这强烈表明参与弛豫事件的分子的数量$N_{corr}$随着$t_a$增加而增加。对于$T=0.96 \times T_g$,我们发现当$t_a$从$1\mathrm{ks}$变为$100\mathrm{ks}$时,$N_{corr}$随$\sim 10%$增加。这为眼镜中的长度尺度和时间尺度之间的关系提供了新的线索。

英文摘要:

We have measured, as a function of the age $t_a$, the aging of the nonlinear dielectric susceptibility $χ_3$ of glycerol below the glass transition. Whereas the linear susceptibility can be accurately accounted for in terms of an age dependent relaxation time $τ_α(t_a)$, this scaling breaks down for $χ_3$, suggesting an increase of the amplitude of $χ_3$. This is a strong indication that the number $N_{corr}$ of molecules involved in relaxation events increases with $t_a$. For $T=0.96 \times T_g$, we find that $N_{corr}$ increases by $\sim 10%$ when $t_a$ varies from $1\mathrm{ks}$ to $100\mathrm{ks}$. This sheds new light on the relation between length scales and time scales in glasses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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