Abstract:
According to classical textbooks on thermodynamics or statistical physics, there are only two types of phase transitions: continuous, or second-order, in which the latent heat ${L}$ is zero, and first-order, in which $L \neq 0$. Present-day textbooks and monographs also mention another, stand-alone type—the Berezinskii–Kosterlitz–Thouless transition, which exists only in two dimensions and shares some features with first- and second-order phase transitions. We discuss examples of nonconventional thermodynamic behavior (i.e., which is inconsistent with the theoretical phase transition paradigm now universally accepted). For phase transitions in smectic liquid crystals, mechanisms for nonconventional behavior are proposed and the predictions they imply are examined.
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