Magnetic Field Dependence of Laser Light Scattering through CBOOA in Nematic Phase |
| |
| Authors: | A Sakamoto U Kubo K Yoshino Y Inulshl |
| |
| Institution: | 1. Department of Electrical Engineering, Faculty of Science and Technology , Kinki University , Higashiosaka, Osaka, Japan;2. Department of Electrical Engineering. Faculty of Engineering , Osaka University , Suita, Osaka, Japan |
| |
| Abstract: | In the nematic phase of homeotropically aligned liquid crystals which have the smectic A phase at lower temperature, interference rings have been observed above some threshold magnetic field Hc which nearly coincides with the ocurrence of Freedericksz transition, only for the light polarized parallel to the direction of magnetic field. This interference ring disappears with increasing magnetic field above second threshold Hs . The origin of these interference rings is explained tentatively by a periodic deformation of bulk directors. The bend elastic constant of CBOOA estimated from the measurements of the interference ring as a function of temperature, diverges with the critical exponent (0.5 ± 0.02) near the smectic A-nematic transition temperature and agrees well with a recent suggestion of McMillan based on the mean field theory. |
| |
| Keywords: | |
|
|
