{"title":"Soft Mode Behavior Near the Critical Endpoint of a Nematic Liquid Crystal with Positive Dielectric Anisotropy","authors":"Yoshinori Takikawa, Taro Tamehiro, Makoto Iwata, Hiroshi Orihara","doi":"10.7566/jpsj.93.064004","DOIUrl":null,"url":null,"abstract":"A critical endpoint appears when a DC electric field is applied to a nematic liquid crystal with positive dielectric anisotropy. We have investigated the soft mode behavior near the critical endpoint of the nematic liquid crystal 8CB by dielectric spectroscopy while finely varying the temperature and DC electric field around it. Using an expression for the dielectric constant derived from the Landau–de Gennes theory, we obtained the relaxation strength and frequency for the soft mode from dielectric dispersions. An increase in relaxation strength and a decrease in relaxation frequency were observed as the critical endpoint was approached, which was expected from the theory.","PeriodicalId":17304,"journal":{"name":"Journal of the Physical Society of Japan","volume":"2 1","pages":""},"PeriodicalIF":1.5000,"publicationDate":"2024-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of the Physical Society of Japan","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.7566/jpsj.93.064004","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
A critical endpoint appears when a DC electric field is applied to a nematic liquid crystal with positive dielectric anisotropy. We have investigated the soft mode behavior near the critical endpoint of the nematic liquid crystal 8CB by dielectric spectroscopy while finely varying the temperature and DC electric field around it. Using an expression for the dielectric constant derived from the Landau–de Gennes theory, we obtained the relaxation strength and frequency for the soft mode from dielectric dispersions. An increase in relaxation strength and a decrease in relaxation frequency were observed as the critical endpoint was approached, which was expected from the theory.
期刊介绍：
The papers published in JPSJ should treat fundamental and novel problems of physics scientifically and logically, and contribute to the development in the understanding of physics. The concrete objects are listed below.
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