Phys. Rev. Lett. 102, 147802 (2009) [4 pages]Unusual Dielectric and Electrical Switching Behavior in the de Vries Smectic A Phase of Two Organosiloxane DerivativesReceived 26 November 2008; published 8 April 2009 X-ray, electrical, electro-optical, and dielectric studies in the de Vries smectic A (SmA) phase of organosiloxane derivatives exhibit features surprisingly different from that of a conventional SmA phase. The switching data show a double peak profile, characteristic of an antiferroelectric (AF) structure. A model with the adjacent smectic layers having an AF-like arrangement and no global tilt correlation is proposed. Observed in molecules with differential interactions between the two termini, these findings have wide ramifications in understanding the minimum layer shrinkage of such systems. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.102.147802
DOI:
10.1103/PhysRevLett.102.147802
PACS:
61.30.Eb, 64.70.M−
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