High-resolution x-ray scattering experiments to study the critical smectic-A fluctuations in the nematic phase have been performed on a mixture of two nonpolar, two-benzene-ring compounds. The ratio T(NA)/T(NI) (= 0.885) for this mixture is much smaller than for previously studied similar materials. The smectic correlation lengths parallel and perpendicular to the smectic-layer normal are found to diverge anisotropically with characteristic exponents-nu parallel-to = 0.75 +/- 0.03, nu perpendicular-to = 0.65 +/- 0.03, and the susceptibility with gamma = 1.24 +/- 0.05.
Physical Review Letters
Copyright 1991 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevLett.67.2037.
Chen, Li; Brock, J. D.; Huang, J. R; Kumar, Satyendra (1991). Critical-Behavior at the Nematic To Smectic-A Transition in a Nonpolar Liquid-Crystal With Wide Nematic Range. Physical Review Letters 67(15) 2037-2040. doi: 10.1103/PhysRevLett.67.2037. Retrieved from https://oaks.kent.edu/phypubs/24