Electric permittivity ∊ and its changes under the influence of DC electric field have been measured in the chiral smectic C phase of p-decyloxy-benzylidene-p-amino-2-methyl-butyl-cinnamte (DOBAMBC). It has been observed that the electric permittivity measured along the direction parallel to smectic layers increases after applying the electric field.
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Hoffman et al. (1985) studied this question.
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