Crossover from XY critical to tricritical behavior of heat capacity at the smectic-A-chiral-smectic-C liquid-crystal transition

被引：32

作者：

Ema, K ^{[1
]}

Yao, H ^{[1
]}

机构：

[1] Tokyo Inst Technol, Fac Sci, Dept Phys, Meguro Ku, Tokyo 152, Japan

来源：

PHYSICAL REVIEW E | 1998年 / 57卷 / 06期

关键词：

D O I：

10.1103/PhysRevE.57.6677

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

High-resolution ac calorimetric measurements have been carried out for four chiral liquid-crystal systems: 4-(1-methylheptyloxycarbonyl) phenyl 4'-octyloxybiphenyl-4-carboxylate, its octylbiphenyl analog, its octyloxycarbonylbiphenyl analog, and 2-fluoro-4-{[(1-trifluoromethyl) undecyloxyl carbonyl) phenyl 4'-(dodecyloxy) biphenyl-4-carboxylate. The heat capacity anomaly around the smectic-A to the chiral-smectic-C transition has been analyzed in detail. It is revealed that the heat anomaly shows a crossover from three-dimensional XY critical to tricritical behavior. All the data are described well with a crossover function which has been obtained by a Rudnick-Nelson type calculation.

引用

页码：6677 / 6684

页数：8

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