English  |  正體中文  |  简体中文  |  Items with full text/Total items : 49378/84106 (59%)
Visitors : 7383066      Online Users : 43
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library & TKU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version
    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/24902


    Title: Critical behavior at the nematic-smectic-A transition in butyloxybenzylidene heptylaniline (4O.7)
    Authors: Garland, C. W.;Meichle, M.;Ocko, B.M.;Kortan, A. R.;Safinya, C. R.;Yu, L.J.;Litster, J. D.;Birgeneau,R.J.
    Contributors: 淡江大學化學學系
    Date: 1983-06
    Issue Date: 2013-07-09 15:25:23 (UTC+8)
    Publisher: College Park: American Physical Society
    Abstract: 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.
    Relation: Physical Review A (General Physics) 27(6), pp.3234
    DOI: 10.1103/PhysRevA.27.3234
    Appears in Collections:[化學學系暨研究所] 期刊論文

    Files in This Item:

    File SizeFormat
    index.html0KbHTML100View/Open

    All items in 機構典藏 are protected by copyright, with all rights reserved.


    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library & TKU Library IR teams. Copyright ©   - Feedback