Abstract
A theoretical tool to determine the dependence of the wavelength of periodic structures on the applied magnetic field in lyotropic liquid crystals in the nematic calamitic phase is proposed. It is assumed that the periodic structure experimentally found can be represented by a sequence of walls. Our calculations indicate that in order to describe the measured behavior of the system above the Fredericks threshold the interaction between these walls must be taken into account. The strength of these interactions and the ratio between the bend and twist elastic constants are also determined. \textcopyright{} 1996 The American Physical Society.
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