Quasiharmonic model for ferroelectric transition in 18O-isotope exchanged SrTiO3

Quasiharmonic model for ferroelectric transition in 18O-isotope exchanged SrTiO3
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18O-同位素交换 SrTiO3 中铁电转变的准谐波模型

DOI:
10.1088/0953-8984/20/5/055223
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发表时间:
2008
期刊:
Journal of Physics: Condensed Matter
影响因子:
--
通讯作者:
H. Mashiyama
H. Mashiyama
中科院分区:
--
文献类型:
--
作者:
S. E. Mkam Tchouobiap;H. Mashiyama

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通过将准谐近似推广到双莫尔斯型局域势中的量子粒子,建立了一个描述氧同位素置换引起的SrTiO 3铁电相变的模型。该理论采用有限温度下的变分原理方法,重点是零点振动中表现出的量子效应。分析了SrTi(16 O 1 − x18 Ox)3的铁电-顺电相变,并将x-Tc相图与实验结果进行了比较,以证实模型的定性有效性。从理论上证明了SrTi(16 O 1-x18 Ox)3的量子力学效应和铁电性的演化,并且当x≥xc <$0.32时,SrTi(16 O 1-x18 Ox)3的软模在铁电相变处表现出完美的软化。最后,研究表明,组分离子的质量的重要性和同位素引入有几个效果,即使质量效应是占主导地位的。
By extending the quasiharmonic approximation to a quantum particle within a local potential of the double Morse type, a model describing the ferroelectric phase transition in SrTiO3 induced by oxygen isotope replacement is developed. The theory uses the variational principle method at finite temperature with emphasis on the quantum effect manifested in zero-point vibration. The ferroelectric–paraelectric transition in SrTi(16O1−x18Ox)3 is analyzed and the x–Tc phase diagram is compared with the experimental one in order to confirm the qualitative validity of the model. The quantum mechanical effect and the evolution of the ferroelectricity in SrTi(16O1−x18Ox)3 are also demonstrated theoretically and the soft mode of SrTi(16O1−x18Ox)3 shows a perfect softening at the ferroelectric phase transition for x≥xc≈0.32. Finally, the study shows the importance of the mass of component ions and that isotope introduction has several effects even if the mass effect is predominant.
S=1/2 自旋键交替链中的场诱导相变和长程有序,相互作用令人沮丧
DOI: --
发表时间: 2005
期刊: J.Phys.Soc.Jpn. 74 Suppl.
影响因子: --
作者:
N.Maeshima et al.
通讯作者: N.Maeshima et al.
“通过光散射研究同位素交换的 SrTi^<18>O_3 钛酸锶中铁电模式的完美软化”
DOI: --
发表时间: 2006
期刊: Phys. Rev. Lett. 96
影响因子: --
作者:
M. Takesada;M. Itoh;A. Onodera;and T. Yagi;Masaki TAKESADA;Tadahiko ISHIKAWA;Seiko MOURI;Masaki TAKESADA;Hiroki TANIGUCHI;Masaki TAKESADA
通讯作者: Masaki TAKESADA