Confrontation between noise and dielectric measurements on a liquid crystal in the paraelectric SA and ferroelectric SC* phases

R. Douali; G. Leroy; J. Gest; C. Legrand; P. Tabourier; H. T. Nguyen

doi:10.1051/epjap:2000195

EPJ

Confrontation between noise and dielectric measurements on a liquid crystal in the paraelectric S_A and ferroelectric S_C* phases

R. Douali¹, G. Leroy¹, J. Gest¹, C. Legrand¹, P. Tabourier¹ and H. T. Nguyen²

¹ Laboratoire d'Étude des Matériaux et des Composants pour l'Electronique, Université du Littoral Côte d'Opale, 19 rue Louis David, B.P. 717, 62228 Calais, France
² Centre de Recherche Paul Pascal, Université de Bordeaux I, avenue Schweitzer, 33600 Pessac, France

Received: 10 March 1999
Revised: 21 October 1999
Accepted: 21 October 1999
Published online: 15 January 2000

Abstract

Dielectric and noise measurements versus frequency have been performed on a liquid crystal in the paraelectric S_A and ferroelectric $S^*_{\rm C}$ phases. A confrontation of these measurements is presented on the basis of the fluctuation-dissipation theorem which shows that these techniques both give similar results linked to the observation of the classical soft mode and Goldstone mode in the S_A and $S^*_{\rm C}$ phases respectively.

PACS: 61.30.Gd – Orientational order of liquid crystals; electric and magnetic field effects on order / 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 77.22.Gm – Dielectric loss and relaxation

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EPJ

Confrontation between noise and dielectric measurements on a liquid crystal in the paraelectric SA and ferroelectric SC* phases

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Confrontation between noise and dielectric measurements on a liquid crystal in the paraelectric S_A and ferroelectric S_C* phases