A symmetric tricritical point (TCP) is demonstrated for the nematic-smectic A transition by blending two nearly identical isomers and by showing that the difference in coexistence values of the nematic order parameter S goes to zero with TCP exponent β2 = 1 as TTCP is approached. A horizonta λ-line is associated with an observed universal behavior of S when a new scaling of T is used.
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Rananvare et al. (1987) studied this question.
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