Ultrasonic attenuation near the cholesteric → smectic A transition |
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Authors: | S Keyser J Kurmer C Raymond AE Lord |
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Institution: | Department of Physics and Atmospheric Science, Drexel University, Philadelphia, PA 19104, U.S.A. |
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Abstract: | Ultrasonic attenuation at 2 MHz has been measured through the cholesteric → smectic A transition in cholestryl nonanoate. Very near the transition, 0.1 < (T ? Tc) < 0.6°C, the excess attenuation varies as (T ? Tc)n, where n for four separate runs varies between 0.30 and 0.34. These values are very close to the exponent of 0.33 predicted using a scaling laws and observed for the divergence of the twist viscosity in the nematic phase as the smectic A transition is approached. |
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