Nonlinear dielectric spectroscopy in frequency domain has been applied to antiferroelectric liquid crystals in various smectic phases including antiferroelectric SmC*A, SmC*F12 and incommensurate SmC*α phases. We have observed different characteristic third-order nonlinear dielectric spectra ε* 3 in respective phases. In SmC*A and SmC* F12 phases, nonlinear dielectric response originated from Goldstone-like fluctuation with long relaxation time along the helical structure have been observed, which cannot be usually observed in linear spectrum. In the SmC*α phases, we have observed the critical behavior of soft mode that condenses in the SmC* α phase by ε*3. The obtained nonlinear dielectric spectra are discussed by using phenomenological models for respective relaxation.
|Publication status||Published - Dec 1 2004|
|Event||9th International Conference on Ferroelectric Liquid Crystals, FLC 2003 - Dublin, Ireland|
Duration: Aug 24 2003 → Aug 29 2003
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics