Softening of infrared-active mode of perovskite BaZrO3 proved by terahertz time-domain spectroscopy

被引：35

作者：

Helal, M. A. ^{[1
]}

Mori, T. ^{[1
]}

Kojima, S. ^{[1
]}

机构：

[1] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058573, Japan

来源：

APPLIED PHYSICS LETTERS | 2015年 / 106卷 / 18期

关键词：

SRTIO3;

D O I：

10.1063/1.4919913

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The low-frequency infrared-active optical modes were studied in a barium zirconate, BaZrO3, single crystal with the perovskite structure using terahertz (THz) time-domain spectroscopy (TDS). The real and imaginary parts of the dielectric constants were accurately determined in the frequency range between 0.2 and 2.7 THz. Upon cooling from room temperature to 8K, the lowest-frequency TO1 mode at 2.32 THz showed a pronounced softening to 1.94 THz. The real part of the dielectric constant at 0.5 THz determined by THz-TDS obeys Barrett's relation, and the existence of a plateau confirms that the quantum effects lead to saturation of the soft mode frequencies of the TO1 and TO2 modes below approximate to 20 K. This is reminiscent of incipient ferroelectrics with the perovskite structure such as CaTiO3. (C) 2015 AIP Publishing LLC.

引用

页数：4

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