title: Surface and bulk elasticity determined fluctuation regimes in smectic membranes.
abstract: We report combined x-ray photon correlation spectroscopy (XPCS) and neutron spin echo (NSE) measurements of the layer-displacement fluctuations in smectic liquid-crystal membranes in the range from 10 ns to 10 micros. NSE reveals a new regime, determined by bulk elasticity, in which relaxation times decrease with the wave vector of the fluctuations. XPCS probes slower surface-tension-dominated relaxation times, independent of the wave vector. XPCS gives a difference in correlation times at specular and off-specular positions that can be related to different detection schemes.
authors: FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.
authors: Irakli
authors: I
authors: Sikharulidze
authors: Bela
authors: B
authors: Farago
authors: Igor P
authors: IP
authors: Dolbnya
authors: Anders
authors: A
authors: Madsen
authors: Wim H
authors: WH
authors: De Jeu