Structural study of the smectic-C twist grain boundary phase (TGBC) under external electric field
Centre de recherche Paul-Pascal - Avenue A. Schweitzer, F-33600 Pessac, France
Accepted: 16 September 1996
We report structural X-ray studies on well-aligned TGBC samples under an external DC electric field applied perpendicular to the pitch direction. On increasing the field, the helical structure is progressively distorted and finally unwound in a way which confirms the previously assumed picture of local spontaneous polarizations perpendicular to the helical axis (helielectric model). In terms of de Gennes' analogy with type-II superconductors, the behaviour is analogous to a static distorsion of the Abrikosov flux lattice by a spatially modulated Laplace force.
PACS: 61.30.Gd – Orientational order of liquid crystals; electric and magnetic field effects on order / 64.70.Md – Transitions in liquid crystals / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics
© EDP Sciences, 1996