Vojko Matko (Author), Ewa Górecka (Author), Damian Pociecha (Author), Joanna Matraszek (Author), Nataša Vaupotič (Author)

Abstract

The magnitude of the relative permittivity of the ferroelectric nematic phase (NF ) has been the subject of lively scientific discussion since the phase was recently discovered. Dielectric spectroscopy measurements (DSMs) give a huge value of relative permittivity, which depends on the cell thickness, but this is argued to result from a misinterpretation of the DSM results. We have conducted DSM using a set of cells differing in thickness of the NF layer, type of electrodes, and presence/absence of nanoscale-thick surface polymer layers. To model the DSM results, cells are presented by an equivalent electric circuit that includes a capacitor due to the NF layer with frequency dependent complex relative permittivity, capacitors due to surface layers, and a resistor describing the limited conductivity of electrodes. DSM results for different cells with the same liquid crystal in the NF phase are semiquantitatively reproduced by the same set of physical parameters if a huge relative permittivity of the NF , which is even orders of magnitude larger than the measured apparent values, is assumed. We show that the capacitance of surface layers should also be considered in cells with no polymer alignment layer on the electrodes.

Keywords

liquid crystals;statistical physics;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FNM - Faculty of Natural Sciences and Mathematics
Publisher: American Physical Society
UDC: 532.783
COBISS: 212927491 Link will open in a new window
ISSN: 2643-1564
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Downloads: 6
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Other data

Secondary language: Slovenian
Secondary keywords: Tekoči kristali;Statistična fizika;
Type (COBISS): Scientific work
Pages: 6 str.
Volume: ǂVol. ǂ6
Issue: ǂiss. ǂ4, [article no.] L042017
Chronology: 2024
DOI: 10.1103/PhysRevResearch.6.L042017
ID: 25420108