Terahertz dielectric response of cubic BaTiO3

Ponomareva  I; Bellaiche  L; Ostapchuk  THlinka  JPetzelt  J

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Terahertz dielectric response of cubic BaTiO3

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摘要

A first-principles-based approach is developed to study the dielectric response of paraelectric BaTiO3, 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.

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《Physical review, B. Condensed matter and materials physics》 |2008年第1期|012102-1-012102-4-0|共4页
作者
Ponomareva I; Bellaiche L; Ostapchuk THlinka JPetzelt J;
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作者单位

Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA;

Acad Sci Czech Republic, Inst Phys, Prague 18221 8, Czech Republic;

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正文语种英语
中图分类固体物理学;
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SOFT-MODE SPECTROSCOPY; HYPER-RAMAN SCATTERING; 1ST PRINCIPLES; FERROELECTRIC PEROVSKITES; TEMPERATURE PROPERTIES; PHASE-TRANSITIONS; BARIUM-TITANATE; DYNAMICS; KNBO3; FILMS;

Terahertz dielectric response of cubic BaTiO3

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