| Title: | Interpretation of dielectric spectroscopy measurements of ferroelectric nematic liquid crystals |
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| Authors: | ID Matko, Vojko (Author)
ID Górecka, Ewa (Author)
ID Pociecha, Damian (Author)
ID Matraszek, Joanna (Author)
ID Vaupotič, Nataša (Author) |
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| Files: |  RAZ_Matko_Vojko_2024.pdf (669,38 KB)
MD5: 06266F21B2FF1A5C06C35EE3BF856697
 https://doi.org/10.1103/PhysRevResearch.6.L042017
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| Language: | English |
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| Work type: | Scientific work |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FERI - Faculty of Electrical Engineering and Computer Science
FNM - Faculty of Natural Sciences and Mathematics
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| 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. |
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| Keywords: | liquid crystals, statistical physics |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 07.02.2024 |
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| Article acceptance date: | 26.09.2024 |
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| Publication date: | 18.10.2024 |
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| Publisher: | American Physical Society |
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| Year of publishing: | 2024 |
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| Number of pages: | 6 str. |
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| Numbering: | Letn. 6, št. 4, št. članka L042017 |
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| PID: | 20.500.12556/DKUM-91111  |
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| UDC: | 532.783 |
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| ISSN on article: | 2643-1564 |
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| COBISS.SI-ID: | 212927491 |
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| DOI: | 10.1103/PhysRevResearch.6.L042017 |
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| Publication date in DKUM: | 27.11.2024 |
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| Views: | 275 |
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| Downloads: | 43 |
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| Metadata: |    |
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| Categories: | Misc.
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