标题： A2SmTaO6 的电导率谱的尺度分析揭示了 A = Ba、Sr、Ca 中不同的输运响应 显示英文标题

标题： Scaling of the Electrical Conductivity Spectra Reveals Distinct Transport Responses in A2SmTaO6 [A = Ba, Sr, Ca]

摘要： 无序在材料科学中起着重要作用，影响材料在不同长度尺度上的行为。 像空位、原子取代、晶格畸变和微观结构不均匀性等缺陷会破坏理想的周期性，从而改变物理性质。 类似于自旋玻璃系统，当载流子遇到无序的能量景观时，会产生电的“玻璃态”，导致广泛的弛豫时间，尤其是在多晶材料中，偶极子经历竞争的交换相互作用。 复数阻抗、介电常数和电 modulus 分离出单独的电阻和电容效应，提供了关于微观结构不均匀性如何影响导电机制的见解。 在多晶双钙钛矿 A2SmTaO6 (A = Ba, Ca) 中，由于幂律驱动的交流电导率，载流子的跳跃和弛豫受到晶粒和晶界的影响。 交流电导率和阻抗响应的标度揭示了导电性和弛豫时间尺度之间的相关性。 “受挫”偶极子局部能量景观的不均匀性限制了整个体材料尺度上导电机制的“普遍性”。 显示英文摘要

摘要： Disorder plays an important role in materials science, influencing material behavior across different length scales. Imperfections like vacancies, atomic substitutions, lattice distortions, and microstructural inhomogeneities, disrupt ideal periodicity thereby altering physical properties. Analogous to spin-glass systems, electrical 'glassiness' arises when charge carriers confront disordered energy landscapes, leading to a broad range of relaxation times, especially in polycrystalline materials where dipoles experience competing exchange interactions. Complex impedance, permittivity, and electric modulus distill out separate resistive and capacitive effects, offering insights into how microstructural inhomogeneities affects conduction mechanism. In polycrystalline double perovskites A2SmTaO6 (A = Ba, Ca), with a power law driven ac conductivity, the hopping and relaxation of carriers is affected by both grains and grain boundaries. Scaling of ac conductivity and impedance response reveals correlation between conduction and relaxation timescales. The inhomogeneities in local energy landscape of 'frustrated' dipoles restrict the 'universality' of conduction mechanism across the bulk length scale.