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本文考虑在N→SA相变中,当T→Tc+(相交点)时,声在液晶中传播引起的压力效应。使用模-模耦合方法计算了声的衰减和色散,得到在高频区间,声的衰减有反常发散行为,在低频极限声衰减的临界指数为2.5.当T→Tc+时,本文的理论曲线大体上与实验结果相一致。The pressure effects which induce by sound wave propagation in liquid crystal near N-SA phase transition when T → Tc+ has been considered.We have calculated the ultrasonic attenuation coefficient and the dispersion by use of mode-mode coupling theory. It is found that for high frequency the behaviour of attenuation has anomalous divergence, in low frequency limit it's critical exponent is 2.5.When T→Tc+, the theoretical curves are nearly in agreement with experiment results.
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