High-frequency dielectric behavior of a ferroelectric liquid crystal near the smectic-C*-smectic-A phase transition
Citation:
Costello, P.G., Kalmykov, Yu.P., Vij, J.K. `High-frequency dielectric behavior of a ferroelectric liquid crystal near the smectic-C*-smectic-A phase transition? in Physical Review A, 46, 8, (1992), pp 4852 - 4858Download Item:
Abstract:
The temperature and frequency dependence of the complex dielectric susceptibility of a ferroelectric liquid crystal (FLC) near the smectic-C*-smectic-A phase transition has been calculated using the generalized Landau model. It is shown that, although the dielectric response of the Sm-C* phase consists generally of four modes (soft, Goldstone, and two high-frequency polarization modes), only three bands appear in the dielectric-loss spectrum of FLC's at the Sm-A-Sm-C* phase transition. The calculations based on the generalized Landau model show that the frequency split of the two high-frequency modes is too low to be detected as two separate relaxation processes. A special technique has to be used to split these modes. At the Sm-A-Sm-C* phase transition this process does not split or broaden. These results are in agreement with the recent experimental data. It is shown that in the light of these calculations a revision of the theory as proposed by Pleiner and Brand [Phys. Rev. A 43, 7064 (1991); Mol. Cryst. Liq. Cryst. Lett. 8, 11 (1991)] is rather unnecessary.
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http://people.tcd.ie/jvijDescription:
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Author: VIJ, JAGDISH KUMAR
Publisher:
American Physical SocietyType of material:
Journal ArticleSeries/Report no:
Physical Review A46
8
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