Universal power law in the orientational relaxation in thermotropic liquid crystals

Chakrabarti, Dwaipayan ; Jose, Prasanth P. ; Chakrabarty, Suman ; Bagchi, Biman (2005) Universal power law in the orientational relaxation in thermotropic liquid crystals Physical Review Letters, 95 (19). 197801_1-197801_4. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v95/i19/e197801

Related URL: http://dx.doi.org/10.1103/PhysRevLett.95.197801

Abstract

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.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:4059
Deposited On:13 Oct 2010 06:54
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