Dynamics of glasslike transitions in a quasi-two-dimensional system.
Dynamics of glasslike transitions in a quasi-two-dimensional system.
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准二维系统中玻璃态转变的动力学。
DOI：
10.1103/physrevlett.74.2284
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发表时间：
1995
影响因子：
8.6
通讯作者：
Wu
中科院分区：
文献类型：
--
作者：
Hwang;Wu
利用实空间成像测量了场致磁性胶体链的横向自扩散。发现均方位移< Δ r2>依赖于取向场H，并表现出两种不同的行为。在短时间内< Δ r2>为亚扩散，而在长时间内< Δ r2>为正常扩散.分离两个时间制度的特征时间随H呈指数发散，表明系统中的密度波动快速冻结。我们的实验结果偏离模式耦合理论的预测显着。
Transverse self-diffusion of field-induced magnetic colloidal chains is measured using real-space imaging. It has been found that the mean-square displacement< Δ r 2> depends on the aligning field H and displays two different behaviors. In short times< Δ r 2> is subdiffusive, whereas in long times< Δ r 2> exhibits normal diffusion. The characteristic time separating the two time regimes diverges exponentially with H, indicating fast frozen-in density fluctuations in the system. Our experimental results deviate significantly from the predictions of mode-coupling theory.