A study of the ferroelectric phase transition in PbHPO4by optical second-harmonic generation
- 20 March 1988
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 21 (8) , 1661-1671
- https://doi.org/10.1088/0022-3719/21/8/036
Abstract
Optical second-harmonic generation (SHG) is investigated in wedge-shaped PbHPO4 single crystals in various configurations of propagation and polarisation of the radiation between -50 and 75 degrees C. The temperature dependence of seven of the ten components of the nonlinear susceptibility is measured in the ferroelectric phase and absolute values are determined at -50 degrees C by comparison with quartz. In certain configurations of measurement the temperature dependence of the components follows closely that of the spontaneous polarisation PS(T). A small but finite SHG is observed in the paraelectric phase which can be attributed to short-range ferroelectric order.Keywords
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