Resonant Carbon K-Edge Soft X-Ray Scattering from Lattice-Free Heliconical Molecular Ordering: Soft Dilative Elasticity of the Twist-Bend Liquid Crystal Phase

Resonant x-ray scattering shows that the bulk structure of the twist-bend liquid crystal phase, recently discovered in bent molecular dimers, has spatial periodicity without electron density modulation, indicating a lattice-free heliconical nematic precession of orientation that has helical glide sy...

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Published in:Physical review letters 2016-04, Vol.116 (14), p.147803-147803, Article 147803
Main Authors: Zhu, Chenhui, Tuchband, Michael R, Young, Anthony, Shuai, Min, Scarbrough, Alyssa, Walba, David M, Maclennan, Joseph E, Wang, Cheng, Hexemer, Alexander, Clark, Noel A
Format: Article
Language:English
Subjects:
Carbon
Dimers
Liquid crystals
Nematic
Precession
Scattering
Surface layer
Texture
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cited_by cdi_FETCH-LOGICAL-c424t-c2fc32118d3d409f49f95144fb0b444940e612980fc01b137b0edd29f77b95733
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container_end_page 147803
container_issue 14
container_start_page 147803
container_title Physical review letters
container_volume 116
creator Zhu, Chenhui
Tuchband, Michael R
Young, Anthony
Shuai, Min
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Walba, David M
Maclennan, Joseph E
Wang, Cheng
Hexemer, Alexander
Clark, Noel A
description Resonant x-ray scattering shows that the bulk structure of the twist-bend liquid crystal phase, recently discovered in bent molecular dimers, has spatial periodicity without electron density modulation, indicating a lattice-free heliconical nematic precession of orientation that has helical glide symmetry. In situ study of the bulk helix texture of the dimer CB7CB shows an elastically confined temperature-dependent minimum helix pitch, but a remarkable elastic softness of pitch in response to dilative stresses. Scattering from the helix is not detectable in the higher temperature nematic phase.
doi_str_mv 10.1103/PhysRevLett.116.147803
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source American Physical Society:Jisc Collections:APS Read and Publish 2023-2025 (reading list)
subjects Carbon
Dimers
Liquid crystals
Nematic
Precession
Scattering
Surface layer
Texture
title Resonant Carbon K-Edge Soft X-Ray Scattering from Lattice-Free Heliconical Molecular Ordering: Soft Dilative Elasticity of the Twist-Bend Liquid Crystal Phase
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