Giant photo-induced dielectricity in SrTiO3

被引：90

作者：

Hasegawa, T ^{[1
]}

Mouri, S ^{[1
]}

Yamada, Y ^{[1
]}

Tanaka, K ^{[1
]}

机构：

[1] Kyoto Univ, Fac Sci, Dept Phys, Kyoto 6068502, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2003年 / 72卷 / 01期

关键词：

quantum paraelectric; Debye-type relaxation; photo-induced polar domain;

D O I：

10.1143/JPSJ.72.41

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Dielectric properties are studied in quantum paraelectric SrTiO3 under UV-light illumination from 100 Hz to 1 MHz at low temperatures. We demonstrate that the complex dielectric constant is strongly enhanced by interband photo-excitation. Dispersion measurements confirm that the photo-induced Debye-type relaxator enhances the dielectric constant. The anomalous temperature and excitation-density dependence of the relaxation time suggests that photo-induced polar domains with finite lifetime lead to the novel dielectric properties.

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页码：41 / 44

页数：4

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