title: Polarization periodicity in the B(1) columnar phase determined by resonant x-ray scattering.
abstract: We report structural results that evidence the polarization distribution of the blocks in the columnar phase of an achiral bent-core liquid crystal. The study was performed using resonant x-ray diffraction at the sulfur K edge on oriented samples aligned on substrates. The extra periodicity is revealed through the violation of the systematic extinction rule of the structural symmetry group along the experimentally accessible diffraction direction. Further data obtained from the polarization analysis of a resonant reflection give information concerning the transition mechanism between B(1) and B(2) phases.
authors.affiliation: Física de la Materia Condensada, Facultad de Ciencia y Tecnología, UPV/EHU, E-48080 Bilbao, Spain.
authors.forename: C L
authors.initials: CL
authors.lastname: Folcia
authors.forename: J
authors.initials: J
authors.lastname: Ortega
authors.forename: J
authors.initials: J
authors.lastname: Etxebarria
authors.forename: LiDong
authors.initials: L
authors.lastname: Pan
authors.forename: Shun
authors.initials: S
authors.lastname: Wang
authors.forename: C C
authors.initials: CC
authors.lastname: Huang
authors.forename: V
authors.initials: V
authors.lastname: Ponsinet
authors.forename: P
authors.initials: P
authors.lastname: Barois
authors.forename: R
authors.initials: R
authors.lastname: Pindak
authors.forename: N
authors.initials: N
authors.lastname: Gimeno