亚磷酸三苯酯中力学弛豫和发散剪切波传播长度尺度的$α$尺度解耦
$α$-Scale Decoupling of the Mechanical Relaxation and Diverging Shear Wave Propagation Lengthscale in Triphenylphosphite
摘要：
我们在$\sim$ 10 - 500 MHz频率范围内进行了去极化脉冲受激散射实验，观察了过冷亚磷酸三苯酯（TPP）中的剪切声学声子。这些测量，在串联与先前进行的纵向和剪切测量，允许进一步分析的模式耦合理论（MCT）的框架内的TPP的弛豫动力学。我们的研究结果提供了证据$α$耦合之间的剪切和纵向自由度的去耦温度$T_c$ = 231 K。液体中剪切波传播的下限长度尺度验证了理论预测的退耦温度附近的指数。
英文摘要：
We have performed depolarized Impulsive Stimulated Scattering experiments to observe shear acoustic phonons in supercooled triphenylphosphite (TPP) from $\sim$10 - 500 MHz. These measurements, in tandem with previously performed longitudinal and shear measurements, permit further analyses of the relaxation dynamics of TPP within the framework of the mode coupling theory (MCT). Our results provide evidence of $α$ coupling between the shear and longitudinal degrees of freedom up to a decoupling temperature $T_c$ = 231 K. A lower bound length scale of shear wave propagation in liquids verified the exponent predicted by theory in the vicinity of the decoupling temperature.
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