| Autor: |
B K, McCoy, Z Q, Liu, S T, Wang, R, Pindak, K, Takekoshi, K, Ema, A, Seed, C C, Huang |
| Rok vydání: |
2007 |
| Zdroj: |
Physical review. E, Statistical, nonlinear, and soft matter physics. 75(5 Pt 1) |
| ISSN: |
1539-3755 |
| Popis: |
Previous results from Kundu using dielectric relaxation have suggested a reentrant antiferroelectric-ferroelectric-antiferroelectric transition in the compound LN36. Our comprehensive studies of this compound using differential optical reflectivity, nonadiabatic scanning calorimetry, null transmission ellipsometry, and resonant x-ray diffraction show that in fact LN36 exhibits the usual phase sequence for chiral smectic liquid crystals: SmA*-SmC*alpha-SmC*-SmC*FI1-SmC*A . Moreover, the SmC*alpha-SmC* transition is a first-order transition, characterized by a discontinuous change in the helical pitch. At temperatures just above the SmC*alpha-SmC* transition, two different values for the helical pitch are simultaneously observed for the first time. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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