On the critical behaviour of the N-SmA phase transition in an induced system: an exploration from high-resolution calorimetric and optical studies

ABSTRACTA systematic study of a binary system composed of 4-n-pentyl 4′-cyanobiphenyl (5CB) and 4-n-pentyl phenyl 4-n′-hexyloxy benzoate (ME6O.5) mesogens showing an induced smectic A at different molar concentrations has been done. Heat capacity and optical birefringence measurements have been performed around the N-SmA phase transition region. The heat capacity peaks could be fitted well below the N-SmA transition by means of an extended Landau mean-field model. The first-order nature of the transition throughout the composition range can be inferred. This transition is rather close to the tricritical point when the nematic range is sufficiently increased. The latent heat decreases with the increase in the nematic range. For large nematic range, the latent heat drops to zero and the heat capacity peak associated with N-SmA phase transition disappear, contrary to previously reported most of the usual N-SmA phase transition. Precision birefringence measurements also agree well with the heat capacity data.KEYWORDS: Phase transitionheat capacitybirefringencelatent heatinduced smectic A phase Disclosure statementNo potential conflict of interest was reported by the author(s).Additional informationFundingMKD acknowledges the financial support received from the University Assistance for Research Project [Project No: 2321/R-2022] and AP is grateful to the University Grants Commission [UGC/NFOBC/201920-19J6148547, JRF] for awarding fellowship.