Positional order in Langmuir monolayers

V.M. Kaganer, G. Brezesinski, H. Möhwald, P.B. Howes, K. Kjær

    Research output: Contribution to journalJournal articleResearch


    We find that a structural solid-solid phase transition in a two-dimensional Langmuir film is accompanied by strong positional disorder. Specifically, we find by a grazing-incidence x-ray diffraction experiment that in monolayers of octadecanol both the hexagonal phase LS and the centered rectangular (distorted hexagonal) phase S have algebraic decay of positional correlations. The positional disorder is evidenced by variations of the exponent eta, which drastically increases at the transition. The disorder is attributed to elastic distortions around pretransitional fluctuations.
    Original languageEnglish
    JournalPhysical Review Letters
    Issue number26
    Pages (from-to)5864-5867
    Publication statusPublished - 1998


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