块体材料中奇异动力学的发现：CaCu3Ti4O12中的相关偶极子
Discovery of Strange Kinetics in Bulk Material: Correlated Dipoles in CaCu3Ti4O12
摘要：
在宽的温度（10- 300 K）和频率（0.5Hz-2 MHz）范围内进行了CaCu 3 Ti4 O 12的介电谱。我们属性的介电常数阶跃下降的柯克伍德-Fröehlich偶极子相关性的演变，减少由于反平行取向偶极子的时刻密度，随着温度的降低。Unambibibiente的次Arabic分散相关联的损失峰揭示了奇怪的动力学的主要作用;用于描述非线性支配的介观约束/分形系统，在这里见证了第一次在散装材料。有效能标随热演化而变化，关联长度在100 K以下达到介观尺度。温度依赖性的相关性揭示了一个新的，平行偶极子取向的分支低于85 K。观察到的新功能定义了一个交叉温度窗口连接单偶极子制度和相关的时刻。Conciling已知的结果，我们提出了一个分形状的自相似配置的Ca/Cu丰富的子相，由此产生的异质性赋予CaCu 3 Ti4 O 12其特有的电气行为。
英文摘要：
Dielectric spectroscopy of CaCu3Ti4O12 was performed spanning broad ranges of temperature (10-300K) and frequency (0.5Hz-2MHz). We attribute the permittivity step-fall to the evolution of Kirkwood-Fröehlich dipole-correlations; reducing the moment-density due to anti-parallel orienting dipoles, with decreasing temperature. Unambiguous sub-Arrhenic dispersion of the associated loss-peak reveals the prime role of strange kinetics; used to describe nonlinearity-governed meso-confined/fractal systems, witnessed here for the first time in a bulk material. Effective energy-scale is seen to follow thermal evolution of the moment density, and the maidenly estimated correlation-length achieves mesoscopic scale below 100K. Temperature dependence of correlations reveals emergence of a new, parallel-dipole-orientation branch below 85K. Novel features observed define a crossover temperature window connecting the single-dipoles regime and the correlated moments. Conciling known results, we suggest a fractal-like self-similar configuration of Ca/Cu-rich sub-phases; resultant heterogeneity endowing CaCu3Ti4O12 its peculiar electrical behaviour.
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