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http://hdl.handle.net/2289/2844| Title: | Dielectric studies in the vicinity of the A-C* transition |
| Authors: | Krishna Prasad, S. Khened, S.M. Raja, V.N. Chandrasekhar, S. Shivkumar, B. |
| Keywords: | oldstone mode; soft mode; Landau coefficients; effect of chain length |
| Issue Date: | Jan-1993 |
| Publisher: | Taylor & Francis Group |
| Citation: | Ferroelectrics, 1993, Vol.138, p37-49 |
| Abstract: | We have studied the soft mode and Goldstone mode relaxations in a ferroelectric liquid crystal compound (referred to as C6 for short) exhibiting a high value of spontaneous polarisation. The results show that the relaxation frequency fs as well as the dielectric strength b.Deltab.epsiS can be described by a simple power law, but gives non-mean field exponents. However, fitting done to the b.Deltab.epsis data using an expression given by the generalised mean field theory, not only yields the mean field susceptibility exponent b.gamma but also helps in determining the Landau coefficients a and C (where a is the electroclinic coefficient and C the polarisation-tilt coupling constant) as well as the soft mode viscosity. We also present the Goldstone mode viscosity and the relevant elastic torque data. Measurements on C7 and C8, the higher homologs of C6, bring out the effect of chain length on the relaxation parameters. |
| Description: | Restricted Access. |
| URI: | http://hdl.handle.net/2289/2844 |
| ISSN: | 0015-0193 1563-5112(Online) |
| Alternative Location: | http://dx.doi.org/10.1080/00150199308017713 |
| Copyright: | 1993 Taylor & Francis Group |
| Appears in Collections: | Research Papers (SCM) |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 1993 Ferroelectrics V138 p37.pdf Restricted Access | Restricted Access. | 404.8 kB | Adobe PDF | View/Open Request a copy |
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