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Low-frequency Raman Scattering of ferroelectric LiH3(SeO3)2 near the melting point
- The central peak of the Raman spectrum of LiH3(SeO3)2 was measured from 300 K to the melting point (383 K). With increasing temperature, the line width takes a minimum value around 360 K. As temperature was raised to the melting point, the anomalous increase in the line width was found. It is shown that the central peak around the room temperature is caused by the polarization fluctuation associated with the ferroelectric-paraelectric phase transition. The anomalous increase of the line width is discussed in relation to the melting of the crystal.