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Showing papers by "Shri Singh published in 2006"


Journal ArticleDOI
TL;DR: From the S-T phase diagram, it is found that the stability of field-induced nematic phase increases with pressure, whereas the discontinuity of the transition decreases, and the region where paranematic phase transits directly to smectic A phase increased with pressure.
Abstract: Within the framework of Landau-de-Gennes formulation, we analyse the effect of pressure on electric-field-induced phase transitions in a liquid crystal which shows spontaneously an isotropic-smectic A transition. Inferring from the experimental pressure dependences on the layer spacing in smectic A phase, as well as the nematic-smectic A metastable temperature T*AN, we incorporated the pressure dependence in the free energy through (the surface energy term) and the coupling between the quadrupolar nematic ordering Qij and the smectic order parameter ψ. From the S-T phase diagram, we found that the stability of field-induced nematic phase increases with pressure, whereas the discontinuity of the transition decreases. Also, the region where paranematic phase transits directly to smectic A phase increases with pressure.

9 citations