Date of Original Version
Strong pretransitional divergence of shear viscosity was observed for the first time near a smectic-A—smectic-B phase transition by capillary shear flow with the layer normal perpendicular to both the flow velocity and velocity gradient. The results are inconsistent with a single power-law type of critical exponent and are suggestive of an essential singularity. Possible implications of the results for recently proposed models of the smectic-B phase and mechanisms for smectic-A—smectic-B phase transitions are discussed.
S. Bhattacharya and S. V. Letcher. (1979). "Observation of Pretransitional Divergence of Shear Viscosity near a Smectic-A—Smectic-B Phase Transition." Physical Review Letters, 42(7), 458. Available at: http://dx.doi.org/10.1103/PhysRevLett.42.458