Dislocation-loop-mediated smectic melting

Dislocation-loop-mediated smectic melting
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位错环介导的近晶熔化

DOI:
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发表时间:
2006
期刊:
影响因子:
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通讯作者:
D. Roux
D. Roux
中科院分区:
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文献类型:
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作者:
P. Moreau;L. Navailles;J. Giermanska;O. Mondain;F. Nallet;D. Roux

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我们报告了使用冷冻断裂透射电子显微镜直接观察到在近晶胆甾(N*)相变附近的溶致体系中的拓扑熔化。位错的扩散导致至少一个,也可能是两个中间阶段,其特征是位错环的定向有序和随后的螺旋位错线的解除。
We report the direct observation, using freeze-fracture transmission electron microscopy, of topological melting in a lyotropic system in the vicinity of a smectic-cholesteric (N*) phase transition. The proliferation of dislocations leads to at least one, and possibly two intermediate phases, characterised by orientational ordering of the dislocation loops and the subsequent unbinding of the screw-dislocation lines.