Abstract
High-resolution heat-capacity measurements have been carried out on the chiral and racemic versions of 2-methylbutyl-4\ensuremath{'}-$n$-pentyloxy-biphenyl-4-carboxylate (2M45OBC). Both smectic-$A$---smectic-$C$ and smectic-$A$---chiral-smectic-$C$ transitions are found to be mean-field-like with a large sixth-order term in the Landau free-energy expansion. Our results also shed light on similarities and differences between the chiral and racemic compounds.
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