Theoretical approach to study the electroclinic effect very near to the Smectic C* –Smectic A* transition point of FLC molecules

Abstract

We propose a theoretical approach considering Landau type free energy expansion in order to understand the electroclinic effect appearing very close to the transition region between Smectic-C* to Smectic-A* phases. A new secondary order parameter is considered, and expressing it as the fluctuations of the applied field very close to the transition point, the capacitive nature of the system is addressed successfully at this very region. More over we have been able to show that the modulated Smectic-C* phase may be considered to be responsible for the origination of the electroclinic behavior.