High-Resolution X-Ray Study of a Smectic-A-Smectic-C Phase Transition

C. R. Safinya, M. Kaplan, Jens Aage Als-Nielsen, R. J. Birgeneau, D. Davidov, J. D. Litster, D. L. Johnson, M. E. Neubert

    Research output: Contribution to journalJournal articleResearchpeer-review


    We report measurements of the tilt angle Φ and the planar spacing dC near the second-order SmC-SmA transition in 4-n-pentyl-phenylthiol-4′-n-octyloxybenzoate (8S̅ 5). We find that the ratio Φ/invcos(dC/dA) is constant (1.2 ± 0.1) through the C phase, supporting a simple molecular-tilt model for the transition. For 5×10-3>1-T/Tc>3×10-5, Φ exhibits mean-field behavior. A simple Ginzburg-criterion argument indicates that the true critical region should be unobservably small for most A-C transitions.
    Original languageEnglish
    JournalPhysical Review B
    Issue number9
    Pages (from-to)4149-4153
    Publication statusPublished - 1980

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