PAa13 共鳴X線散乱により4層周期構造が確認されたSm-C_A^*副次相の反強誘電性

概要

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Between Sm-C_A^* and Sm-C^*, there exist a variety of subphases which form the devil's staircase. The phase sequences were identified as I^* - I_A^* - C_A^* - spr3 - C_γ^* - spr2 -AF - spr1 - C^* - C_α^* - A by electro-optical methods. Recently, the three-layer periodicity and the four-layer periodicity were confirmed in the subphases of 10OTBBB1M7 by resonant X-ray scattering [Mach et al., PRL, 81 (1998) 1015]. Both were reported to be identified as ferrielectric. But the above phase sequence determined by electro-optical methods together with the molecular arrangements based on the Ising model [Yamashita et al., Ferroelectrics, 148 (1993) 1] clearly indicates that the four-layer periodic subphase should be antiferroelectric. We have actually confirmed its antiferroetectricity by observing the electric-field dependence of conoscopic figures.
日本液晶学会の論文
1999-09-28