Universal power law in the orientational relaxation in thermotropic liquid crystals

被引：25

作者：

Chakrabarti, D ^{[1
]}

Jose, PP ^{[1
]}

Chakrabarty, S ^{[1
]}

Bagchi, B ^{[1
]}

机构：

[1] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 19期

关键词：

D O I：

10.1103/PhysRevLett.95.197801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We observe a surprisingly general power law decay at short to intermediate times in orientational relaxation in a variety of model systems (both calamitic and discotic, and also lattice) for thermotropic liquid crystals. As all these systems transit across the isotropic-nematic phase boundary, two power law relaxation regimes, separated by a plateau, emerge, giving rise to a steplike feature (well known in glassy liquids) in the single-particle second-rank orientational time correlation function. In contrast to its probable dynamical origin in supercooled liquids, we show that the power law here can originate from the thermodynamic fluctuations of the orientational order parameter, driven by the rapid growth in the second-rank orientational correlation length.

引用

页数：4

共 24 条

[11] MODIFICATION OF THE OVERLAP POTENTIAL TO MIMIC A LINEAR SITE-SITE POTENTIAL [J].