Dielectric spectroscopy of a ferroelectric nematic liquid crystal and the effect of the sample thickness
Dielectric spectroscopy of a ferroelectric nematic liquid crystal and the effect of the sample thickness
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铁电向列液晶的介电谱及样品厚度的影响
DOI:
10.1016/j.molliq.2023.122566
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发表时间:
2023
影响因子:
6
通讯作者:
Erkoreka A
中科院分区:
文献类型:
--
作者:
Erkoreka A
The recently discovered ferroelectric nematic liquid crystals have been reported to exhibit very large dielectric permittivity values. Here, we report a systematic investigation of the dielectric behavior of a prototypical ferroelectric nematogen by varying the thickness of the parallel capacitor measuring cell. While in the non-polar high temperature nematic phase results show only slight differences due to slight variations of the alignment, the measured permittivity values in the ferroelectric nematic phase show a linear dependence on the cell thickness. It is also shown that the characteristic relaxation frequency decreases inversely proportionally to the thickness. The results are discussed in terms of three different available models based on different underlying mechanisms, accounting for cancellation of the probe electric fields by polarization reorientation or by ionic charges, or based on a recently proposed continuous phenomenological model.
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