Two Experimental Tests of the Halperin-Lubensky-Ma Effect at the Nematic–Smectic-APhase Transition

Anand Yethiraj, John Bechhoefer
2000 Physical Review Letters  
We have conducted two quantitative tests of predictions based on the Halperin-Lubensky-Ma (HLM) theory of fluctuation-induced first-order phase transitions. First, we explore the effect of an external magnetic field on the nematic-smectic-A (NA) transition in a liquid crystal. Second, we examine the dependence of the first-order discontinuity as a function of mixture concentration in pure 8CB and three 8CB-10CB mixtures. We find the first quantitative evidence for deviations from the HLM theory.
doi:10.1103/physrevlett.84.3642 pmid:11019166 fatcat:kw2grcfovncsnnxigcobqzhvnq