A Generalized Hysteresis Model of Antiferroelectric Liquid Crystals

概要

論文の詳細を見る
In this paper, we shall put forward a generalized irreversible rotation model which takes account of the long-range couplings between the adjacent dipoles in each layer to explain the experimentally observable hysteresis curves in ferro-, antiferro-and ferrielectric phases with the corresponding wave numbers of the ferroelectric orderings along the layer normal. It is found that the long-range interaction between the dipoles critically affects on the dynamic response under an alternating electric field. In the present model, it may be possible to explain the experimentally found subphases of the antiferroelectric materials in a unified framework. That is, the dynamic response of the possible phases between the ferroelectric(SmC^*)phase(the upper temperature)and the antiferroelectric(SmC^*_A)phase(the lower temperature)will be substantially explained by a unified irreversible model under an alternating electric field. In addition, the hysteresis curve with the devil's staircase, as seen in the field-induced phase transitions, is found to be critically affected by the coupling strength between the spontaneous polarizations in each layer. We shall also show that the present model may be considered as a candidate to explain the thresholdless, hysteresis-free, the V-shaped switching as has been experimentally found.
社団法人応用物理学会の論文
2000-07-15