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  • Title: Raman scattering study of phase biaxiality in a thermotropic bent-core nematic liquid crystal.
    Author: Park MS, Yoon BJ, Park JO, Prasad V, Kumar S, Srinivasarao M.
    Journal: Phys Rev Lett; 2010 Jul 09; 105(2):027801. PubMed ID: 20867740.
    Abstract:
    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.
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