Observation of Fano asymmetry in Raman spectra of SrTiO3 and CaxSr1-xTiO3 perovskite nanocubes

被引：73

作者：

Banerjee, Sarbajit ^{[1
]}

Kim, Dae-In

Robinson, Richard D.

Herman, Irving P.

Mao, Yuanbing

Wong, Stanislaus S.

机构：

[1] Columbia Univ, Mat Res Sci & Engn Ctr, New York, NY 10027 USA

[2] Columbia Univ, Dept Appl Phys & Appl Math, New York, NY 10027 USA

[3] SUNY Stony Brook, Dept Chem, Stony Brook, NY 11794 USA

[4] Brookhaven Natl Lab, Condensed Matter Phys & Mat Sci Dept, Upton, NY 11973 USA

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 22期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2400095

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Bulk SrTiO3 is cubic and not expected to exhibit any first-order Raman scattering. However, nanocubes of SrTiO3 with an edge length of 80 +/- 10 nm show strong first-order Raman scattering originating from the breaking of symmetry caused by frozen surface dipoles (local tetragonality) and the presence of nanoscopic polar domains (arising from incorporated impurities). Rapid polarization fluctuations within these nanoscopic ferroelectric regions interfere with a polar phonon, resulting in a Fano-like asymmetric line shape in these SrTiO3 nanocubes, as well as in Ca0.3Sr0.7TiO3 nanocubes. (c) 2006 American Institute of Physics.

引用

页数：3

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