Phase Transition in Surface-Aligned Nematic Films
Phase Transition in Surface-Aligned Nematic Films
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DOI：
10.1103/physrevlett.37.1059
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发表时间：
1976-10
影响因子：
8.6
通讯作者：
P. Sheng
中科院分区：
文献类型：
--
作者：
P. Sheng
在硅中观察到[A. Hauer 和 S.J，Burns，Appl。物理。莱特。 27, 524 (1975)]。 B.W.巴特曼和 H. 科尔，Rev. Mod。物理。 36, 681 (1964)。热振动对 A.T. 的影响，并且，一般而言，“关于 X 射线的动态衍射，已得到很好的确立。结构因子 I'& 乘以 Debye-%aller 因子 e @。实验证明在以下参考文献中给出：B. Okkerse，Philips Res. Rep. 17, 464 (1962)；B.%. Batterxnan，Phys. Rev. 1M，A1354 (1964)；B.%. Batterxnan，Phys. Rev. 1M，A1354 (1964)； H. Wagenfeld 和 D. Ling, 15, 8 (1965); K. Kohra, S. Annaka, 和 S. Nakano, J. Phys. 21, 1565 (1966)。 2285 (1964), 和 21, 2300 (1966}. D. L. Spears, Phys. Rev. B 2, 1981 (1970} E. D. Palik 和 R. Bray, Phys. Rev. B 8, 8802 (1971). D. A. 0 Connor, Proc. Phys. Soc., London 91, 917 (1967). 在 5x 5x 20 mm、无位错硅晶体的方形端上蒸发 CdS 传感器，其长边平行于 [111]，通过点接触技术在 CdS 中施加射频场 (v = 0.9 6Hz} 来压电激发纵向 [111] 声子。该实验中使用了 pt ~ 70。发现当声子存在时，来自 (220) 平面的异常衍射光束 x' 减少了 16°/o。还发现，从与 CdS 换能器相反的方形端获得的 (220) Bxagg 情况衍射轮廓。后一个观察结果进一步证实了异常传递相对于 BrRgg cRSe dlffrRction 的卓越灵敏度。该实验是由我们之一（R.C.}与法国格勒诺布尔马克斯普朗克研究所和劳厄-朗之万研究所的 W. Arnold 和 A. Freund 合作进行的。R. Kohler、W. Marbling 和 H. Peibst, Phys. Status Solidi 41, 75 (1970)。相同的理论可用于解释我们在布拉格案例中获得的结果（参见 Hef. 1）。
observed in silicon [A. Hauer and S. J, Burns, Appl. Phys. Lett. 27, 524 (1975)]. B.W. Batterman and H. Cole, Rev. Mod. Phys. 36, 681 (1964). The effect of thermal vibrations on A.T. , and, in general„on dynamical diffraction of x rays, is well established. The structure factor I'& is multiplied by the Debye-%aller factor e @. Experimental proofs are given in the following refexences: B. Okkerse, Philips Res. Rep. 17, 464 (1962); B.%. Batterxnan, Phys. Rev. 1M, A1354 (1964); H. Wagenfeld and D. Ling, Phys. Lett. 15, 8 (1965); K. Kohra, S. Kikuta, S. Annaka, and S. Nakano, J. Phys. Soc. Jpn. 21, 1565 (1966). An extensive theoretical treatment is given by Y. H. Otsuki, J. Phys. Soc. Jpn. 19, 2285 (1964), and 21, 2300 (1966}. D. L. Spears, Phys. Rev. B 2, 1981 (1970} E. D. Palik and R. Bray, Phys. Rev. B 8, 8802 (1971). D. A. 0 Connor, Proc. Phys. Soc. , London 91, 917 (1967). A CdS transducer was evaporated on the square end of a 5x 5x 20-mm, dislocation-free silicon crystal, with the long edge parallel to [111]. Longitudinal [111] phonons were piezoelectrically excited at xoom temperature in CdS by applying an rf field (v = 0.9 6Hz} by means of a point contact technique. Cu-An x-ray radiation (A. =1.54 A) was used in this experiment, for which pt ~ 70. It was found that the anomalously diffxacted beam from the (220) planes was x'educed by 16~/o when phonons were present. No satellites were found on the wings of the (220) diffraction peak. It was also found that the (220) Bxagg case diffraction profile, obtained from the square end opposite to that on which the CdS transducer was evaporated, did not show any effect in the presence of phonons. The latter observation is a further confirmation of the superior sensitivity of anomalolls transmission with respect to BrRgg cRSe dlffrRction. This experiment was performed by one of us (R.C.} in collaboration with W. Arnold and A. Freund, at the Max-Planck and the Laue-Langevin Institutes in Grenoble, France. R. Kohler, W. Marbling, and H. Peibst, Phys. Status Solidi 41, 75 (1970). The same theory can be used for interpreting our results obtained in the Bragg case (see Hef. 1).