Laboratoire de Physique Théorique de la Matière Condensée, Université Pierre et Marie Curie, CNRS UMR 7600, Boite 121, 4, Place Jussieu, 75252 Paris Cedex 05, France.
Phys Rev Lett. 2010 Dec 3;105(23):235504. doi: 10.1103/PhysRevLett.105.235504.
The ac conductivity spectra of xAgI-(1 - x)AgPO(3) fast-ion conducting glasses spanning the flexible, intermediate (isostatically rigid), and stressed rigid phases are analyzed. The rescaled frequency-dependent spectra are mapped into time-dependent mean-square displacements out of which a typical length scale characterizing the spatial extent sqrt[(R(2)(∞))] of nonrandom subdiffusive regions of ionic motions is computed. The latter quantity is studied as a function of AgI compositions, and is found to display a maximum isostatic compositions, providing the first clear evidence of a typical length scale of a dynamical nature when a system becomes isostatically rigid and enters that phase.
研究了跨越柔性、中间（静压刚性）和受压刚性相的 xAgI-(1 - x)AgPO(3)快离子导电玻璃的交流电导率谱。重新标度的频率相关谱映射到离子运动的非随机亚扩散区域的空间扩展的时间相关均方位移，从中计算出典型的长度尺度 sqrt[(R(2)(∞))]。研究了后者作为 AgI 组成的函数，发现当系统变得静压刚性并进入该相时，在静压刚性组成处显示出最大值，这是系统具有动力学性质的典型长度尺度的第一个明确证据。
