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: |
2024 |
Typology: |
1.01 - Original Scientific Article |
Organization: |
UM FNM - Faculty of Natural Sciences and Mathematics |
Publisher: |
American Physical Society |
UDC: |
532.783 |
COBISS: |
212927491
|
ISSN: |
2643-1564 |
Views: |
0 |
Downloads: |
6 |
Average score: |
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Metadata: |
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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 |