Nonuniversal critical behavior at the uniaxial-biaxial nematic phase transition in a lyotropic mixture

被引：12
|
作者：
Thieghi, LT [1 ]
Shibli, SM [1 ]
Neto, AMF [1 ]
Dmitriev, VP [1 ]
Toledano, P [1 ]
机构：
[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil
来源：
PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 14期
关键词：
D O I：
10.1103/PhysRevLett.80.3093
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Measurements of the order-parameter critical exponent beta at the uniaxial-biaxial nematic phase transition in a lyotropic mixture are reported. They reveal a strong dependence of beta on the concentration of the mixture compounds with two distinct intervals of values separated by a discontinuity. This nonuniversal behavior is interpreted as the result of three different contributions, which express the micellar biaxiality and the distribution of the micellar population with respect to biaxiality and volume.
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页码：3093 / 3096
页数：4
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