Terahertz dielectric response of cubic BaTiO3

被引：135

作者：

Ponomareva, I. ^{[1
]}

Bellaiche, L. ^{[1
]}

Ostapchuk, T. ^{[2
]}

Hlinka, J. ^{[2
]}

Petzelt, J. ^{[2
]}

机构：

[1] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA

[2] Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic

来源：

PHYSICAL REVIEW B | 2008年 / 77卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.77.012102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A first-principles-based approach is developed to study the dielectric response of paraelectric BaTiO(3), as a function of frequency and temperature. Two different overdamped modes of comparable strengths are found to contribute to such response, in the similar or equal to 1-150 cm(-1) frequency range for temperatures up to similar or equal to 750 K. The lower frequency mode softens toward the Curie point, while the higher-frequency mode stays in the 60-100 cm(-1) range and is associated with temperature-independent short-range correlations. Our far-infrared reflectivity measurements confirm the existence of these two modes, and yield a very good agreement with calculations.

引用

页数：4

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