手性近晶液晶中未倾斜相变的临界波动

Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics Pub Date : 2000-12-01 DOI:10.1103/physreve.62.r7599

Shibahara, Yamamoto, Takanishi, Ishikawa, Takezoe

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引用次数: 5

摘要

在手性近晶液晶的Sm-A-Sm-C*和Sm-A-Sm-C(*)(A)跃迁附近测量了层压缩模量B。B表现出明显的过渡前软化，这是由于相变以上的阶参量波动所致。Sm-A-Sm-C*和Sm-A-Sm-C(*)(A)跃迁的临界区宽度小于Sm-A-Sm-C(*)(α)跃迁的临界区宽度。B的临界指数与基于重整化群方法的理论描述一致。结果表明，这些跃迁不属于朗道平均场类型。

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Critical fluctuations at the untilted-tilted phase transition in chiral smectic liquid crystals

The layer compression modulus B was measured near the Sm-A-Sm-C* and Sm-A-Sm-C(*)(A) transitions of chiral smectic liquid crystals. B shows a marked pretransitional softening due to the order parameter fluctuations above the phase transition. The width of the critical region of the Sm-A-Sm-C* and Sm-A-Sm-C(*)(A) transitions is smaller than that of the Sm-A-Sm-C(*)(alpha) transition. The critical exponents of B are in agreement with the theoretical description based on renormalization-group method. These results reveal that these transitions are not of the Landau mean-field type.

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Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics

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