Phenomenological Model for Smectic C Phases With Separate Tilt Angles for the Layer Thickness and the Optical Axis

References

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• Wulf , A. Phys. Rev. , A (in press). Also, the interaction between the longitudinal dipole moments of the molecules, considered by D. Cabib and L. Benguigui (J. Phys., 38, 419 (1977). favours ∊ > 0 even if the molecular tilts are disordered. Still another, possibly very important, effect favouring ∊ > 0 might be a steric one. Molecules which have alkyl chains at their ends and rotate freely about their long axes have an effective dumb-bell-like shape. Therefore, when confined to layers such molecules may have a minimum average diameter for some ∊ > 0. E.g., see molecular model calculations in W.L.McMillan, Phys. Rev., A4, 1238 (1971).
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