Raman Spectra of Ferroelectric Soft Mode in SrTiO 3 : Effect of Electric Field
Raman Spectra of Ferroelectric Soft Mode in SrTiO 3 : Effect of Electric Field
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SrTiO 3 中铁电软模式的拉曼光谱：电场的影响
DOI：
10.1080/00150190390205861
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发表时间：
2003
期刊：
影响因子：
0.8
通讯作者：
M. Itoh
中科院分区：
文献类型：
--
作者：
T. Shigenari;K. Abe;K. Yamashita;Tomohiko Takemoto;Ruiping Wang;M. Itoh
测量了SrTiO3单晶的拉曼光谱。在SrTi18O3Tc=24K以下的铁电相中，观察到两个模在Tc=24K加热时软化，这两个模被指定为高于Tc的四方相中铁电软Eu对称模的两个分裂分量。软模的存在表明，SrTi18O3的铁电性本质上是本征的。在SrTi16O3中，外加电场显著地增强了Eu模的拉曼强度，并诱导了与不同对称模的相互作用。在SrTi18O3铁电相中，电场对软模的影响较小。
Raman spectra in SrTiO 3 single crystals were measured. In the ferroelectric phase below T c = 24 K in SrTi 18 O 3, two modes were observed to soften on heating towards T c = 24 K. These modes are assigned as the two split components of the ferroelectric soft E u -symmetry mode in the tetragonal phase above T c . The existence of the soft modes suggests that the ferroelectricity in SrTi 18 O 3 is intrinsic in nature. In SrTi 16 O 3, external electric field significantly increases the Raman intensity of the E u mode and induces the interaction with different symmetry modes. In the ferroelectric phase of SrTi 18 O 3, the electric field has much smaller influence on the soft modes.