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- W2007388081 abstract "Several years ago de Gennes predicted that orientational director fluctuations in a nematic liquid crystal, in zero field, fulfill the conditions of a 3D Heisenberg system. The verification of this prediction by neutron scattering represents a challenge, since the relevant time scale is macroscopic and the substance has no positional order. We have looked for real-time fluctuations of the liquid diffraction peaks and analyzed the observed time series by the Hurst-exponent (H) method. In zero magnetic field we find H ∼ 1, indicating infinite temporal correlations between orientational fluctuations of the director. With increasing magnetic field we observe a cross-over to H ∼ 0.5, corresponding to zero temporal correlations. A similar cross-over is found by the application of a temperature gradient, or by heating to the isotropic liquid phase." @default.
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- W2007388081 date "1995-08-01" @default.
- W2007388081 modified "2023-09-27" @default.
- W2007388081 title "Observation of fluctuations in a three-dimensional Heisenberg system with positional disorder" @default.
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- W2007388081 doi "https://doi.org/10.1016/0921-4526(95)00088-q" @default.
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