Observation of the Smectic C -- Smectic I Critical Point

Details Observation of the Smectic C -- Smectic I Critical Point Observation of the Smectic C -- Smectic I Critical Point

1994-11-18

arxiv.org/abs/cond-mat/9411076v1

Physics

Condensed Matter

9 pages Latex and 5 postscript figures available from prasad@rri.ernet.in on request, Phys.Rev.Lett. (in press)

Scientific paper

10.1103/PhysRevLett.74.270

We report the first observation of the smectic C--smectic I (C--I) critical point by Xray diffraction studies on a binary system. This is in confirmity with the theoretical idea of Nelson and Halperin that coupling to the molecular tilt should induce hexatic order even in the C phase and as such both C and I (a tilted hexatic phase) should have the same symmetry. The results provide evidence in support of the recent theory of Defontaines and Prost proposing a new universality class for critical points in layered systems.

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