On isotropic states in α-LiNH4SO4 crystals

The spectral and baric dependences of the birefringence of α-LiNH 4 SO 4 crystals are studied. It is found that the birefringence is rather sensitive to uniaxial compressions. A baric shift of the isotropic point to longer or shorter wavelengths depending on the uniaxial compression direction is obs...

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Bibliographic Details
Published in:Optics and spectroscopy 2014-11, Vol.117 (5), p.756-758
Main Authors: Stadnyk, V. Yo, Brezvin, R. S., Rudysh, M. Ya, Shchepanskyi, P. A., Gaba, V. M., Kogut, Z. A.
Format: Article
Language:English
Subjects:
Condensed-Matter Spectroscopy
Lasers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
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Summary:The spectral and baric dependences of the birefringence of α-LiNH 4 SO 4 crystals are studied. It is found that the birefringence is rather sensitive to uniaxial compressions. A baric shift of the isotropic point to longer or shorter wavelengths depending on the uniaxial compression direction is observed and a generalized temperature-spectral-baric diagram of the isotropic state is plotted. A possibility of the appearance of a pseudoisotropic state under the action of uniaxial pressure σ z or simultaneous pressures σ x = σ z is shown.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X14110216