High-Resolution X-Ray Study of a Second-Order Nematic—Smectic-APhase Transition
High-Resolution X-Ray Study of a Second-Order Nematic—Smectic-APhase Transition
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二阶向列-近晶-A 相变的高分辨率 X 射线研究
DOI：
10.1103/physrevlett.39.352
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发表时间：
1977
影响因子：
8.6
通讯作者：
C. Safinya
中科院分区：
文献类型：
--
作者：
J. Als;R. Birgeneau;M. Kaplan;J. Litster;C. Safinya
本文用高分辨X射线散射方法研究了N-对氰基亚苄基-对辛氧基苯胺（CBOOA）中与向列相-近晶相-A相转变有关的临界涨落。结果表明，对于8× 10− 5 <$T Tc − 1 <$2 × 10− 2，横向和纵向相关长度以相同的指数发散，即，|ν L− ν T| < 0.03。当接近Tc时，系统似乎在约10− 3的温度下从氦场临界行为过渡到平均场临界行为。
We have carried out a high-resolution x-ray-scattering study of the critical fluctuations in the nematic phase associated with the nematic-smectic-A transition in N-p-cyanobenzylidene-p-octyloxyanilene (CBOOA). It is shown that for 8× 10− 5≲ T T c− 1≲ 2× 10− 2 the transverse and longitudinal correlation lengths diverge with identical exponents, that is,| ν L− ν T|< 0.03. As one approaches T c the system appears to crossover from helium-to mean-field critical behavior at a reduced temperature of∼ 10− 3.