Collective dielectric processes at the transition temperature of the Sm -C* and Sm -A* phase in a ferroelectric liquid crystal
Abstract
An anomalous dielectric relaxation process, called the partially unwound helical mode (p-UHM), is a collective dielectric process apart from the well known Goldstone and soft mode process; it is studied in the smectic C* (Sm -C* ) phase and at the transition temperature of the Sm -C*−Sm -A* phase in the ferroelectric liquid crystal (FLC) material. To avoid the surface effect, a thick cell of 40 μm thickness was prepared with highly rubbed surfaces of the ITO substrates. It has been observed that the dielectric properties in Sm -C* and at the Tc temperature are dominated by the p-UHM process which is dependent on an applied oscillating field in the Sm -C* phase. The probing ac and dc bias field dependences of all these collective dielectric processes have been reported in the Sm -C* and Sm -A* phases of FLC materials.
- Publication:
-
Physical Review E
- Pub Date:
- June 2018
- DOI:
- 10.1103/PhysRevE.97.062707
- Bibcode:
- 2018PhRvE..97f2707G