Journal of the Physical Society of Japan p. 3242 - 3249 (1984)
Update date:2022-08-11
Topics:
Ushio
The principal values and the rotation angle of the optical indicatrix and the optical birefringence of CsH//2PO//4 have been measured at 589 nm as a function of temperature both in the paraelectric and the ferroelectric phases. Rotation of the optical indicatrix with temperature about the b-axis is within 1 degree between 100 K and 300 K. The spontaneous birefringence determined for (010) plate by the usual procedure reaches a maximum at about 15 K below T//c, then becomes negative with decreasing temperature. Similar behavior is found for (100) plate. It is found that these anomalous behaviors of the spontaneous birefringence are caused by the similar anomalous behavior in the spontaneous strain through the elastooptic coupling.
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