Abstract
A reduction in the temperature of the transition to the biphasic and clearing points by the application of a magnetic field in excess of the critical unwinding field has been observed in a cholesteric liquid crystal. This observation qualitatively is in accordance with the phenomenological expansion of the excess free energy in the order parameter S. Inclusion of a twist term in the gradients of S leads to a rescaling of T* which is inversely proportional to the equilibrium pitch P0. When the pitch of the cholesteric liquid crystal is increased or removed by a magnetic field, a reduction in the transition temperature is expected. The observed effect is apparently insignificant in thermotropic liquid crystals but may be more pronounced in the lyotropic liquid crystal of this study due to its very small latent heat.
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