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Critical behavior of the layer compressional elastic constant B at the smectic-A-nematic phase transition.

Abstract The temperature dependence of the layer compressional elastic constant B has been studied in five different compounds in the smectic-A phase on approaching the transition to the nematic phase. A universal exponent Φ = 0.4 ± 0.03 has been measured in the critical domain with a crossover to 0.5 for the fifth compound further away from the transition.