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Physical Review E

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Critical anomalies in thermal diffusivity of liquid-crystalline terephthal-bis-(4- $n$ -butylaniline)

Junko Morikawa¹, Toshimasa Hashimoto¹, Akira Kishi², Yoshio Shinoda³, Kenji Ema¹, and Hideo Takezoe¹

¹Tokyo Institute of Technology, O-okayama 2-12-1, Meguro-ku, Tokyo 152-8550, Japan
²Rigaku Corporation, Matsubara-cho, Akishima, Tokyo 196-8666, Japan
³NETZSCH Japan K.K., Kanagawa-ku, Yokohama 221-0022, Japan

Phys. Rev. E 87, 022501 – Published 1 February, 2013

DOI: https://doi.org/10.1103/PhysRevE.87.022501

Abstract

A temperature wave method has been applied to observe the thermal diffusivity through the isotropic (Iso)–nematic (N)–smectic Sm-A–Sm-C–Sm- $B$ –crystals VI-VII-VIII phase transitions of terephthal-bis-(4- $n$ -butylaniline) (TBBA). Critical anomalies have been found in the N–Sm-A and Sm-C–Sm- $B$ phase transitions as diplike shaped, consistent with the predictions based on the dissipative couplings between the order parameter and the conserved free-energy density. Singular points with a gap have been observed at the Sm- $B$ –crystal VI, crystals VI-VII, and crystals VII-VIII phase transitions, which show polymorphic behaviors on heating and cooling. The second-order Sm-A–Sm-C phase transition emerged as a singular temperature dependence. In all the phases thermal diffusivity decreases with increasing temperature except for Sm-C, where thermal diffusivity increases with increasing temperature. The origin of the anomaly in the thermal diffusivity in Sm-C is discussed based on the parametric analysis of dynamic critical behavior in the Sm-A–Sm-C phase transitions together with the tilt angle change obtained by use of simultaneous measurements of x-ray diffraction and differential scanning calorimetry.

Article Text

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