Polarized Raman spectroscopy was used to investigate the development of orientational order and the degree of phase biaxiality in a bent-core mesogenic system. The values of the uniaxial order parameters ⟨P200⟩ and ⟨P400⟩, and biaxial order parameters ⟨P220⟩, ⟨P420⟩, and ⟨P440⟩, and their evolution with temperature were determined. The temperature dependence of almost all order parameters reveals a second order transition from the uniaxial to biaxial nematic phase with ⟨P220⟩ increasing to ∼0.22 before a first order transition to the smectic-C phase, upon cooling.
Physical Review Letters
Copyright 2010 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.105.027801.
Park, Min Sang; Yoon, Beom-Kin; Park, Jung Ok; Prasad, Veena; Kumar, Satyendra; Srinivasarao, Mohan (2010). Raman Scattering Study of Phase Biaxiality in a Thermotropic Bent-Core Nematic Liquid Crystal. Physical Review Letters 105(2) doi: 10.1103/PhysRevLett.105.027801. Retrieved from https://oaks.kent.edu/phypubs/91