Nonasymptotic critical 3D-XY behavior for the nematic-smectic-A
1 liquid crystal transition |
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| Authors: | G Nounesis M J Young K I Blum C W Garland R J Birgeneau |
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| Institution: | 1. Departments of Chemistry and Physics, Center for Materials Science and Engineering, 02139, Cambridge, MA, USA
2. School of Science, Massachusetts Institute of Technology, 02139, Cambridge, MA, USA
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| Abstract: | High-resolution X-ray data near the nematic (N)-smectic-A 1 (SmA 1) transition are reported for two polar liquid-crystal systems with large nematic ranges. The correlation volume ξ∥ ξ ⊥ 2 , the smectic order-parameter susceptibility σ, and the heat capacityC p of these systems and two other N-SmA 1 systems are in excellent agreement with exact theoreticalpreasymptotic 3D-XY predictions. The importance of correction terms for ξ∥ ξ ⊥ 2 and σ as well asC p is demonstrated. Universal features of the 3D-XY model are obeyed except for anisotropy in the correlation lengths ξ∥ and ξ⊥. |
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