期刊論文
| 學年 | 71 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 1983-06-01 |
| 作品名稱 | Critical behavior at the nematic-smectic-A transition in butyloxybenzylidene heptylaniline (4O.7) |
| 作品名稱（其他語言） | |
| 著者 | Garland, C. W.; Meichle, M.; Ocko, B.M.; Kortan, A. R.; Safinya, C. R.; Yu, L.J.; Litster, J. D.; Birgeneau,R.J. |
| 單位 | 淡江大學化學學系 |
| 出版者 | College Park: American Physical Society |
| 著錄名稱、卷期、頁數 | Physical Review A (General Physics) 27(6), pp.3234 |
| 摘要 | High-resolution ac calorimetric, x-ray, and light-scattering measurements have been made on N-[4-(n-butyloxy)benzylidene]-4'-(n-heptyl)aniline (4O.7) near the nematic-smectic-A phase transition. This transition is second order, with a variation in Cp which is well described by a critical exponent α=α'=-0.026 corresponding to the three-dimensional XY model. The longitudinal and transverse correlation lengths exhibit single-power-law divergences over the reduced-temperature range 10-2 to 3×10-5 with exponents ν∥=0.78+/-0.02 and ν⊥=0.65+/-0.02, respectively. The anisotropic hyperscaling relation ν∥+2ν⊥+α=2 is satisfied to within the errors. A dynamical-scaling analysis of light-scattering measurements of the bend-mode director fluctuations with elastic constant K3 yields values for ξ∥ which agree absolutely with the x-ray measurements. Thus the data are all internally consistent, and they appear to exclude all current theories of the nematic-smectic-A transition. It is observed that the overall critical behavior in smectic liquid crystals is sensitive to the width of the nematic range; this may offer an explanation for the apparent nonuniversality of the exponents. |
| 關鍵字 | |
| 語言 | en |
| ISSN | 0556-2791 |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | Yu, L.J. |
| 審稿制度 | |
| 國別 | USA |
| 公開徵稿 | |
| 出版型式 | 紙本 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/24902 ) |