Abstract
Using the thermal-lens effect, the specific heat and the thermal conductivity have been measured simultaneously in the isotropic phase of the liquid crystal MBBA (-methoxy benzylidene -butylanyline) near its isotropic-to-nematic transition. Accurate analysis of the lens dynamical behavior yields both transport coefficients provided the change of the refractive index with temperature, , is known. A precise measurement of was carried out separately. The best fits yield the critical exponents 0.52 and 0.65 for and , respectively, with a critical temperature equal to °C, where is the clearing temperature. The present measurements give the first conclusive results on the critical behavior of in the isotropic phase of a liquid crystal.
- Received 23 June 1975
DOI:https://doi.org/10.1103/PhysRevA.13.1177
©1976 American Physical Society