# X-Ray Scattering Study of the $$Smectic-A_1$$ to $$Smectic-A_2$$ Transition

 Title: X-Ray Scattering Study of the $$Smectic-A_1$$ to $$Smectic-A_2$$ Transition Author: Chan, K. K.; Pershan, Peter S.; Sorensen, L. B.; Hardouin, F. Note: Order does not necessarily reflect citation order of authors. Citation: Chan, K. K., Peter S. Pershan, L. B. Sorensen, and F. Hardouin. 1985. X-ray scattering study of the $$smectic-A_1$$ to $$smectic-A_2$$ transition. Physical Review Letters 54(15): 1694-1697. Full Text & Related Files: Chan_X-ray_1985.pdf (654.5Kb; PDF) Abstract: X-ray scattering measurements are reported for critical $$smectic-A_2$$ fluctuations along a line of second-order transitions between the $$smectic-A_1$$ and $$smectic-A_2$$ phases in mixtures of hexylphenyl cyanobenzoyloxy benzoate $$(DB_6)$$ and terephthal-bis-butylaniline (TBBA). The measured exponents $$\gamma = 1.46 \pm 0.05$$ and $$\nu_{\parallel} = \nu_{\perp}= 0.74 \pm 0.03$$ are constant along the second-order line and agree with recent heat-capacity measurements and the scaling law, $$3\nu + \alpha =2$$. They disagree with current theoretical expectations. Published Version: doi:10.1103/PhysRevLett.54.1694 Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:10357693 Downloads of this work: