Journal
LIQUID CRYSTALS
Volume 39, Issue 9, Pages 1149-1157Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2012.704410
Keywords
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Funding
- NSF [DMR-0964765]
- NSLS [DE-AC02 98CH10886]
- Indian National Science Academy, New Delhi
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0964765] Funding Source: National Science Foundation
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We present chemical synthesis, polarising optical microscopy, electric current, and small-angle X-ray scattering measurements on a strongly anisotropic bent-shape liquid crystal material. We find that it has two layer-undulated ferroelectric phases, M1 and M2. In the higher temperature M2 phase the undulation amplitude and period increases on cooling, similar to other published materials. It can be identified with a tilted modulated phase. In the M1 phase the molecular plane is not tilted, and - in sharp contrast with all prior observations - the modulation amplitude and period decrease on cooling. These observations can be explained with a 'leaning' director structure, where the leaning angle is decreasing on cooling.
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