Probing a nonequilibrium Einstein relation in an aging colloidal glass
Probing a nonequilibrium Einstein relation in an aging colloidal glass
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DOI：
10.1103/physrevlett.93.160603
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发表时间：
2004-10-15
影响因子：
8.6
通讯作者：
Gallet, F
中科院分区：
文献类型：
--
作者：
Abou, B;Gallet, F
我们提出了一个直接的实验测量的有效温度的胶体玻璃锂皂石，使用测微珠作为温度计。的非平衡涨落耗散关系，在一个特定的形式修改后的爱因斯坦关系，研究与嵌入在玻璃中的珠的扩散和迁移率测量。我们观察到一个不寻常的非单调行为的有效温度：从浴温度开始，它被发现增加到一个最大值，然后减少回来，随着系统的年龄。我们发现，从爱因斯坦关系所观察到的偏差与先前在动态光散射实验中测得的弛豫时间有关。
We present a direct experimental measurement of an effective temperature in a colloidal glass of laponite, using a micrometric bead as a thermometer. The nonequilibrium fluctuation-dissipation relation, in the particular form of a modified Einstein relation, is investigated with diffusion and mobility measurements of the bead embedded in the glass. We observe an unusual nonmonotonic behavior of the effective temperature: starting from the bath temperature, it is found to increase up to a maximum value, and then decrease back, as the system ages. We show that the observed deviation from the Einstein relation is related to the relaxation times previously measured in dynamic light scattering experiments.