The Lower Frequency Soft-Mode in the Ferroelectric Phase of K_2SeO_4
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In the ferroelectric phase below 7'.(93 K) of K.Se0. a new soft-mode, belonging tothe B. representation, has been observed by means of Raman scattering expertment.This mode is different from the soft A. mode previously reported to soften as T.(129.5 K) was approached from below. The frequency of this newly observed mode isabotut 13.2 cm ' at 9.8 K, and decreases as the temperature increases. The observedresult is discussed in connection with the successive phase transitions in the K.Se0.crystal.
- 社団法人日本物理学会の論文
- 1977-08-15
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