Dynamical mechanism orihe ferreclectric transition caused by isotope exchange
同位素交换引起铁电转变的动力学机制
基本信息
- 批准号:14340086
- 负责人:
- 金额:$ 4.8万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:2002
- 资助国家:日本
- 起止时间:2002 至 2003
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The purpose of this study is to clarify the dynamical mechanism of the appearance of ferroelectricity in SrTi ^<18>O_3(STO18) below T_c=22 K. The Brillouin-Raman scattering, the electric field induced Raman scattering, the hyper Raman scattering, the impulsive stimulated Raman scattering (time-domain measurement), and the dielectric measurement have been performed for this purpose. We finally arrived at the following conclusions. The appearance of ferroelectricity in STO18 comes from the ferroelectric phase transition. The transition is caused basically by the freezing of the ferroelectric E_u soft mode of Slater type. The electric diple-diple interaction in STO18 is almost the same as that in SrTi^<16>O_3 (STO16). Since the E_u soft mode of STO18 has a bigger reduced mass than that of STO16, the quantum fluctuation (zero-point vibration) is suppressed much strongly in STO18 than in STO16. As a consequence, the E_u soft mode can freeze in the case of STO18 and the ferroelectric phase with C_<2v> symmetry appears. The transition is a displacive one, but it is not ideal one (soft mode frequency is not 0 but about 200cm^<-1> at the phase transition temperature T_c). Below T_c, the E_u soft mode splits into two modes ; E_u1 (polarization fluctuation parallel to the spontaneous polarization P_s) and E_u2 (polarization fluctuation perpendicular to P_s).
本研究的目的是阐明SrTi ^<18>O_3(STO18)在T_c=22 K下铁电性出现的动力学机制。为此进行了布里渊-拉曼散射、电场诱导拉曼散射、超拉曼散射、脉冲受激拉曼散射(时域测量)和介电测量。我们最终得出了以下结论。铁电性的出现是由铁电相变引起的。这种转变主要是由Slater型铁电E_u软模的冻结引起的。STO18中的电双重相互作用与SrTi^<16>O_3 (STO16)中的电双重相互作用基本相同。由于STO18的E_u软模比STO16的减少质量更大,因此在STO18中量子涨落(零点振动)被抑制的程度要比在STO16中强得多。结果表明,在STO18的情况下,E_u软模可以冻结,出现C_<2v>对称性的铁电相。这种转变是位移转变,但不是理想的转变(软模频率不是0,而是在相变温度T_c下约200cm^<-1>)。在T_c下面,E_u软模式分为两个模式;E_u1(平行于自发极化P_s的极化波动)和E_u2(垂直于P_s的极化波动)。
项目成果
期刊论文数量(63)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Y.Minaki: "Hyper-Raman Scattering of SrTi^<18>O_3"Journal of the Korean Physical Society. 42. S1290-S1293 (2003)
Y.Minaki:“SrTi^<18>O_3 的超拉曼散射”韩国物理学会杂志。
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- 影响因子:0
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- 通讯作者:
H.Hasebe: "Dynamical Mechanism of the Ferroelectric Phase Transition of SrTi^<18O_3 Studied by Light Scattering"Physical Review. 1368. 014109-1-014109-7 (2003)
H.Hasebe:“通过光散射研究的SrTi^<18O_3铁电相变的动力学机制”物理评论。
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- 影响因子:0
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Y.Tsujimi: "A Light Scattering Studies of Soft Mode in SrTi^<18>O_3"Ferroelectrics. (in press). (2004)
Y.Tsujimi:“SrTi^<18>O_3”铁电体中软模式的光散射研究。
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- 影响因子:0
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T.Yagi: "Isotopically Induced Ferroelectric Phase Transition in SrTi^<18>O_3 Studied by Brillouin and Raman Scattering"Ferroelectrics. 266. 153-163 (2002)
T.Yagi:“通过布里渊和拉曼散射研究的SrTi^18O_3中同位素诱导铁电相变”铁电体。
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- 影响因子:0
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- 通讯作者:
T.Watanuki: "Impulsive Stimulated Raman Scattering Study of SrTi(^<18>Ox^<16>O_<1-x>)_3"Ferroelectrics. 285. 33-39 (2003)
T.Watanuki:“SrTi(^<18>Ox^<16>O_<1-x>)_3 的脉冲受激拉曼散射研究”铁电体。
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Time-Space Scaling near Stress-induced Quantum Critical Point
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22540323 - 财政年份:2010
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$ 4.8万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
Dynamical scaling structure and nano-scale ferroelectric regions in quantum paraelectrics
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Universal understanding of pressure-induced quantum paraelectric state
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17540287 - 财政年份:2005
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Simultaneous Determination of the Time and Space Correlations of Density Fluctuation in Glass Transition of Supercooled Liquid
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12640365 - 财政年份:2000
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$ 4.8万 - 项目类别:
Grant-in-Aid for Scientific Research (C)
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