Ultrasonic observation of a strong pretransitional anomaly near a nematic-smectic-A phase transition

S. Bhattacharya*, B. K. Sarma, John B Ketterson

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Strong anomalies in the velocity and attenuation of longitudinal ultrasound in the megahertz range were observed for the first time in the vicinity of the nematic-smectic-A phase transition in a liquid crystal (terephthal-bis-p-p′-butylaniline). Results are in strong contradiction with theoretical predictions and are qualitatively consistent with a picture involving both critical fluctuations and relaxation of the smectic order parameter, similar to that observed near the λ transition in liquid helium.

Original languageEnglish (US)
Pages (from-to)1582-1586
Number of pages5
JournalPhysical review letters
Volume40
Issue number24
DOIs
StatePublished - Jan 1 1978

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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