Abstract
We report on experiments in nematics with homeotropic alignment where the electrohydrodynamic instability occurs after a bend Freedericksz transition. The threshold of convection, the wave number at onset, and the threshold for the transition between order and disorder in the presence of a stabilizing magnetic field agree with theory. Whereas in the oblique-roll range the behavior of the correlation time of the disordered state exhibits near onset the expected scaling behavior, the disordered state in the normal-roll range at zero magnetic field shows no dynamics below a well-defined value ${\ensuremath{\varepsilon}}_{s}$ of the reduced control parameter, in contrast to theoretical predictions. At ${\ensuremath{\varepsilon}}_{s}$ one has reproducibly a continuous and reversible transition to a dynamic state. We attribute these features to the appearance of chevronlike structures.
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