量子准电性中氧同位素效应和铁电跃迁的注解

2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics Pub Date : 2007-05-27 DOI:10.1109/ISAF.2007.4393235

E. Matsushita, S. Segawa

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引用次数: 0

摘要

通过扩展软声子理论，从光学声子在钙钛矿氧化物中的重要作用出发，研究了SrTi16O3 (ST016)的量子准电(PE)-铁电(FE)跃迁。尽管由轻o原子引起的大零点振动存在固有的量子涨落，但由于o同位素交换1601 -x 18Ox引起的FE跃迁与施加的压力(或单轴应力)效应结合在一起，得到了统一的解释。将计算得到的Tc随x的函数与实验数据进行了比较，得到了较好的一致性，并与氢键铁电体KH2PO4 (KDP)的压力效应进行了比较，讨论了STO 16中量子对电的起源。结果表明，在临界指数为1/2的量子PE-FE跃迁开始于Tc=0时，必须用超越软声子理论的微观理论来分析。

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Note on Oxygen Isotope Effect and Ferroelectric Transition in Quantum Paraelectrics

By extending the soft-phonon theory, a quantum paraelectric(PE)-ferroelectric(FE) transition in SrTi¹⁶O₃ (ST016) is studied from the viewpoint of the important role of optical phonons in perovskite-oxides. In spite of intrinsic quantum fluctuation of large zero-point vibration induced from light O-atoms, the FE transition due to the O-isotope exchange ¹⁶O_1-x ¹⁸O_x is explained in a unified picture by combining with the applied pressure (or uniaxial stress) effect. The calculated T_c as the function of x is compared with the experimental data in rather good agreement, and the origin of quantum paraelectricity in STO 16 is discussed in comparison with pressure effect in hydrogen-bonded ferroelectrics KH₂PO₄ (KDP). As the result, it is suggested that quantum PE-FE transition with the critical exponent 1/2 at T_c=0 where the FE transition will start, must be analyzed by a microscopic theory exceeding soft phonon theory.

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2007 Sixteenth IEEE International Symposium on the Applications of Ferroelectrics

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