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Spatio-temporal Fourier components and soft modes in thermal convection: A neutron scattering study

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Zeitschrift für Physik B Condensed Matter

Abstract

In a nematic liquid crystal subjected to a vertical temperature difference ΔT in a vertical slab container, we find, using real-time and real-space neutron scattering, that the spatiotemporal pattern can be indexed on a two-dimensional lattice with selection rule (h+k)=2n. Higher index modes are sequentially activated as ΔT increases from the convection threshold ΔT c . The frequency softening as ΔT→ΔT c and asT→T 0, the super-cooling limit of the nematic, is discussed.

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Authors and Affiliations

  1. Institutt for energiteknikk, Instituttveien 18, P.O. Box 40, N-2007, Kjeller, Norway

    Tormod Riste & Kaare Otnes

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  1. Tormod Riste
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  2. Kaare Otnes
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Riste, T., Otnes, K. Spatio-temporal Fourier components and soft modes in thermal convection: A neutron scattering study. Z. Physik B - Condensed Matter 77, 369–372 (1989). https://doi.org/10.1007/BF01453784

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  • DOI: https://doi.org/10.1007/BF01453784

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