Critical-like behaviour of glass-forming liquids
Critical-like behaviour of glass-forming liquids
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DOI：
10.1038/nmat2634
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发表时间：
2010-04-01
期刊：
影响因子：
41.2
通讯作者：
Watanabe, Keiji
中科院分区：
文献类型：
--
作者：
Tanaka, Hajime;Kawasaki, Takeshi;Watanabe, Keiji
最近发现，当接近玻璃化转变温度T-g时，液体的动力学不仅急剧减慢，而且逐渐变得更加非均相。从我们对六种不同的玻璃形成液体的模拟和实验中，我们发现非均质动力学是静态结构秩序的临界波动的结果，这与通常认为它纯粹是动态起源的观点相反。结构序参量的静态相关长度和磁化率向理想的玻璃化过渡点呈伊辛类幂律发散。然而，这种结构有序伴随着很少的密度变化，这就解释了为什么迄今为止还没有被静态结构因子检测到。我们的结果表明，在玻璃化转变和临界现象之间存在着远比以前认为的更直接的联系。事实上，玻璃化转变可能是一种新的临界现象，其中结构顺序参数与慢度直接相关。
Recently it has been revealed that when approaching the glass-transition temperature, T-g, the dynamics of a liquid not only drastically slows down, but also becomes progressively more heterogeneous. From our simulations and experiments of six different glass-forming liquids, we find that the heterogeneous dynamics is a result of critical-like fluctuations of static structural order, contrary to a common belief that it is purely of dynamic origin. The static correlation length and susceptibility of a structural order parameter show Ising-like power-law divergence towards the ideal glass-transition point. However, this structural ordering accompanies little density change, which explains why it has not been detected by the static structure factor so far. Our results suggest a far more direct link than thought before between glass transition and critical phenomena. Indeed, the glass transition may be a new type of critical phenomenon where a structural order parameter is directly linked to slowness.