The applied electric field dependences of the field-induced tilt angle and electric displacement are studied in the SmA phase of a ferroelectric liquid crystal. The electroclinic constant and nonlinear dielectric constants obtained from the measured data increase in their magnitude on approaching to the SmA-SmC* phase transition temperature. The temperature dependences of these constants are in a good agreement with those predicted by the phenomenological theory of Landau type for the phase transition, and the phenomenological parameters appearing in the theory can be determined from these constants.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics