A Direct Observation of the Switch-Over Transition in Mixed Liquid Crystals of Opposite Diamagnetic Anisotropies

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Abstract
From deuteron NMR studies of pure mixed liquid crystals of opposite diamagnetic anisotropies, a direct observation of the switch-over transition is reported. At the critical concentration and temperature, two spectra corresponding to two different orientations are observed. No noticeable change in the optical properties was observed around the critical point. At the critical concentration, the higher temperature corresponds' to the orientation similar to that for the system with positive diamagnetic anisotropy in all the cases investigated.