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The effect of magnetic field and convective flow on nematic director fluctuations

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Abstract

The slow orientational fluctuations of the director in the nematic state of d-PAA have been studied by real-time neutron scattering. By analysis of the measured time series we have derived the Hurst exponentH as a function of the applied magnetic field and of the applied vertical temperature difference of the sample. For zero values of both parameters we foundH≥0.9, indicating a high degree of temporal correlation between orientational fluctuations. At increasing field or temperature gradientH approaches a value of 0.5, corresponding to zero temporal correlations.

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Authors and Affiliations

  1. Institutt for Energiteknikk, P.O.B. 40, N-2007, Kjeller, Norway

    K. Otnes & T. Riste

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  1. K. Otnes
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  2. T. Riste
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Otnes, K., Riste, T. The effect of magnetic field and convective flow on nematic director fluctuations. J Stat Phys 78, 453–462 (1995). https://doi.org/10.1007/BF02183359

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