Ferroelectric mesophase with randomized interlayer structure.
Ferroelectric mesophase with randomized interlayer structure.
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具有随机层间结构的铁电中间相。
DOI：
10.1103/physrevlett.91.185501
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发表时间：
2003
影响因子：
8.6
通讯作者：
J. Mieczkowski
中科院分区：
文献类型：
--
作者：
D. Pociecha;M. Čepič;E. Górecka;J. Mieczkowski
我们给出了实验和理论证据，证明了由不对称弯曲型分子构成的新的Sm-X相具有层状、无倾斜、光学单轴和极化方向随机的层状结构。尽管相位差的大小是恒定的，但这种随机性是由于相邻层中极化方向的差异的符号简并造成的。通过外场解除简并，Sm-X相的另外两种结构是可能的。
We present the experimental and theoretical evidence that a new Sm X phase made of asymmetric bent-shaped molecules has a layered, nontilted, optically uniaxial and polarly ordered structure with random direction of the layer polarization. The randomness results from the sign degeneracy of the difference in polarization directions in neighboring layers, although the magnitude of the phase difference is constant. Lifting the degeneracy by external fields two additional structures of the Sm X phase are possible.