Formation of nanoscale polarized clusters as precursors of electronic ferroelectricity probed by conductance noise spectroscopy
Formation of nanoscale polarized clusters as precursors of electronic ferroelectricity probed by conductance noise spectroscopy
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通过电导噪声光谱探测纳米级极化簇的形成作为电子铁电的前体
DOI：
10.1103/physrevb.102.100103
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Hiromi Taniguchi and Takahiko Sasaki
中科院分区：
文献类型：
--
作者：
Jens Mueller;Satoshi Iguchi;Hiromi Taniguchi and Takahiko Sasaki
我们研究了分子二聚体-莫特绝缘体的低频电荷载流子动力学，其中二聚体上的电荷波动的冻结引起电子铁电性。我们表明，电导波动（噪声）光谱允许一个探头在高温下的介电性能的变化，其中样品甚至仍然在导电制度。我们的研究结果解释了电极化状态的形成，导致玻璃和弛豫型铁电行为，经常在这些系统中观察到。明显的两级波动和变化的基础型噪声的发病表明纳米级极性区域的形成，其动力学取决于所施加的电场。因此，电导噪声光谱是一个合适的工具，用于调查在分子和其他，无机电荷驱动的铁电体的电极化动力学的发病。
We investigate the low-frequency charge-carrier dynamics of a molecular dimer-Mott insulator, where the freezing of charge fluctuations on the dimers gives rise to electronic ferroelectricity. We show that conductance fluctuation (noise) spectroscopy allows one to probe changes in the dielectric properties at elevated temperatures, where samples are even still in the conductive regime. Our results explain the formation of electric polarization states leading to glassy and relaxor-type ferroelectric behavior that is frequently observed in these systems. The onset of distinct two-level fluctuations and changes of the underlying-type noise indicate the formation of nanoscale polar regions, the dynamics of which depends on the applied electric fields. Conductance noise spectroscopy therefore is a suitable tool for investigating the onset of electric-polarization dynamics in molecular and other, inorganic charge-driven ferroelectrics.