Magnetic and electric birefringence in the isotropic phase of nematic liquid crystals |
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Authors: | N V Madhusudana S Chandrasekhar |
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Institution: | (1) Raman Research Institute, 560006 Bangalore |
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Abstract: | A theory is developed of the anomalous magnetic and electric birefringence in the isotropic phase of nematic liquid crystals
taking into account orientational correlations between neighbouring molecules. Use is made of a modification of Bethe’s method
due to Krieger and James, and the properties of the system are derived in terms of a single parameter, viz., the two-particle
interaction constant. The expressions for the magnetic and electric birefringence are similar in form to those given by the
phenomenological model of de Gennes. Theoretical curves forp-azoxyanisole reproduce the trends in the observed data. A calculation of the nematic-isotropic transition point confirms
that this treatment is an improvement over the mean field approximation in describing pre-transition phenomena in the isotropic
phase. |
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Keywords: | Magnetic birefringence electric birefringence p-azoxyanisole liquid crystals |
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