Document Type

Article

Date of Original Version

2-12-1979

Abstract

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.

Publisher Statement

©1979 The American Physical Society

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