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Phys. Rev. Lett. 93, 247801 (2004) [4 pages]

New Hexatic Liquid Phase Observed in Lyotropic Thin Films

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Chih-Yu Chao1,*, Ming-Tsong Hsu1, Wen-Jiunn Hsieh1, John T. Ho2, and Ivan J. B. Lin3
1Department of Physics, National Taiwan University, Taipei 10617, Taiwan, Republic of China
2Department of Physics, University at Buffalo, The State University of New York, Buffalo, New York 14260, USA
3Department of Chemistry, National Dong Hwa University, Hualien 97441, Taiwan, Republic of China

Received 18 August 2004; published 6 December 2004

An intermediate surface hexatic phase between the liquid and the crystalline phases has been found for the first time in a lyotropic lamellar liquid-crystal system. This phase is highly unusual in that it has long-range sixfold bond-orientational order but liquidlike nearest-neighbor positional correlations, and could represent a significant departure from our current understanding of defect-mediated melting in two dimensions.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.247801
DOI:
10.1103/PhysRevLett.93.247801
PACS:
61.30.Eb, 64.70.Md

*To whom all correspondence should be addressed.

Electronic address: cychao@ntu.edu.tw