Ukrainian Journal of Physical Optics 

Number  1, Volume 3,  2002

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Optical anisotropy of (C3H7NH3)2CuCl4 and (C3H7NH3)2MnCl4 crystals
Kushnir O.S., Bolesta I.M., Furgala Yu.M., Lutsiv-Shumski L.P., ShopaR.Y., Sveleba S.A.

Physics Department, Lviv Ivan Franko National University 8 Kyrylo and Mefodiy Str., Lviv 79005, Ukraine

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Using the Senarmont and the universal null-polarimetric techniques, the birefringence, optical indicatrix orientation and the gyration of (001) bis-propylammonium tetra-chloro-cuprate crystal are studied above the room temperature. The indicatrix rotation and the normal light wave ellipticity related to the gyration effect are found to be less than ~ 10-4  and ~ 2*10-4  , respectively, including the temperature region of the incommensurate g phase. The birefringence of iso-propylammonium tetra-chloromanganate crystal is also measured and the second-order phase transition at 38 oC is found.

doi 10.3116/16091833/3/1/12/2002

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