Dielectric Properties of a Ferroelectric Nematic Material: Quantitative Test of the Polarization-Capacitance Goldstone Mode.

Autor:	Adaka A; Materials Science Graduate Program, Kent State University, Kent, Ohio 44242, USA.; Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA., Rajabi M; Department of Physics, Kent State University, Kent, Ohio 44242, USA., Haputhantrige N; Department of Physics, Kent State University, Kent, Ohio 44242, USA.; Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA., Sprunt S; Department of Physics, Kent State University, Kent, Ohio 44242, USA.; Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA., Lavrentovich OD; Materials Science Graduate Program, Kent State University, Kent, Ohio 44242, USA.; Department of Physics, Kent State University, Kent, Ohio 44242, USA.; Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA., Jákli A; Department of Physics, Kent State University, Kent, Ohio 44242, USA.; Advanced Materials and Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, USA.
Jazyk:	angličtina
Zdroj:	Physical review letters [Phys Rev Lett] 2024 Jul 19; Vol. 133 (3), pp. 038101.
DOI:	10.1103/PhysRevLett.133.038101
Abstrakt:	The recently discovered ferroelectric nematic (N_{F}) liquid crystals (LC) have been reported to show an extraordinarily large value of the real part of the dielectric constant (ϵ^{'}>10^{3}) at low frequencies. However, it was argued by Clark et al. in Phys. Rev. Res. 6, 013195 (2024)PPRHAI2643-156410.1103/PhysRevResearch.6.013195 that what was measured was the capacitance of the insulating layer at LC or electrode surface and not that of the liquid crystal. Here we describe the results of dielectric spectroscopy measurements of an N_{F} material in cells with variable thickness of the insulating layers. Our measurements quantitatively verify the model by Clark et al. Additionally, our measurements in cells with bare conducting indium tin oxide surface provide a crude estimate of ϵ_{⊥}∼10^{2} in the N_{F} phase.
Databáze:	MEDLINE
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