Ukrainian Journal of Physical Optics 
Number  1, Volume 3,  2002
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Textural and conoscopic studies of chiral liquid crystals possessing cholestric - smectic A or cholesteric-TGB A - smectic A phase transitions  
1Nastishin Yu.A., 2Kleman M., 1Dovgyi O.B.

1Institute of Physical Optics, 23 Dragomanov Str., L'viv 79005, Ukraine
2Laboratoire de Mineralogie-Cristallographie, Boite 115, 4 place Jussieu, 75252 Paris Cedex 05, France

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There exists a well documented analogy between the phase transitions cholesteric - smectic A and normal metal - superconductor in the magnetic field. According to this analogy any chiral liquid crystal (CLC) material exhibiting the smectic A phase can be subscribed either to I or II smectogenic type as a liquid crystal analogue of the superconductor of I or II type, respectively. In this paper we describe our results aimed to develop a simple identification procedure to establish the smectogenic type of CLC material using only a polarization microscope.

doi 10.3116/16091833/3/1/1/2002
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