Anomalous low-energy phonons in nearly tetragonal BiFeO3 thin films

被引：26

作者：

Choi, K. -Y. ^{[1
]}

Do, S. H. ^{[1
]}

Lemmens, P. ^{[2
]}

Wulferding, D. ^{[2
]}

Woo, C. S. ^{[3
]}

Lee, J. H. ^{[3
]}

Chu, K. ^{[3
]}

Yang, C. -H. ^{[3
]}

机构：

[1] Chung Ang Univ, Dept Phys, Seoul 156756, South Korea

[2] Tech Univ Carolo Wilhelmina Braunschweig, Inst Condensed Matter Phys, D-38106 Braunschweig, Germany

[3] Korea Adv Inst Sci & Technol, Dept Phys, Taejon 305701, South Korea

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 13期

关键词：

PHASE;

D O I：

10.1103/PhysRevB.84.132408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present evidence for a concomitant structural and ferroelectric transformation around T-S similar to 360 K in multiferroic BiFeO3/LaAlO3 thin films close to the tetragonal phase. Phonon excitations are investigated by using Raman scattering as a function of temperature. The low-energy phonon modes at 180-260 cm(-1) related to the FeO6 octahedron tilting show anomalous behaviors upon cooling through T-S: (i) a large hardening amounting to 15 cm(-1), (ii) an increase of intensity by one order of magnitude, and (iii) an appearance of a dozen new modes. In contrast, the high-frequency modes exhibit only weak anomalies. This suggests an intimate coupling of octahedron tilting to ferroelectricity leading to a simultaneous change of structural and ferroelectric properties.

引用

页数：4

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