20.500.12556/DKUM-91111 Interpretation of dielectric spectroscopy measurements of ferroelectric nematic liquid crystals 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. liquid crystals statistical physics tekoči kristali statistična fizika true true true American Physical Society Angleški jezik Slovenski jezik Znanstveno delo 2024-11-08 03:06:40 2024-11-27 14:35:02 2025-02-28 10:08:02 0000-00-00 00:00:00 2024 0 0 6 str. št. 4, št. članka L042017 Letn. 6 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-02-07 2024-09-26 2024-10-18 532.783 212927491 10.1103/PhysRevResearch.6.L042017 2643-1564 RAZ_Matko_Vojko_2024.pdf RAZ_Matko_Vojko_2024.pdf 1 06266F21B2FF1A5C06C35EE3BF856697 edd8c29b5ead619e6733dd50082822e086e5a53700eb528edd6cf424636eaa6b bcc5198c-acc2-11ef-82e2-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=186975 https://doi.org/10.1103/PhysRevResearch.6.L042017 0 d31d312a-acc2-11ef-82e2-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=186976 Fakulteta za elektrotehniko, računalništvo in informatiko Fakulteta za naravoslovje in matematiko 0 0 0