Observation of Fano Asymmetry in Raman Spectra of SrTiO3 and Cax Sr1-xTiO3 Perovskite Nanocubes

Authors

Sarbajit Banerjee
Dae In Kim
Richard D. Robinson
Irving P. Herman
Yuanbing Mao, The University of Texas Rio Grande ValleyFollow
Stanislaus S. Wong

Document Type

Article

Publication Date

12-1-2006

Abstract

Bulk SrTi O3 is cubic and not expected to exhibit any first-order Raman scattering. However, nanocubes of SrTi O3 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 SrTi O3 nanocubes, as well as in Ca0.3 Sr0.7 Ti O3 nanocubes.

Comments

© 2006 the authors. Original published version available at http://doi.org/10.1063/1.2400095

Recommended Citation

Peterson, K. I., Pullman, D., Lin, W., Minei, A. J., & Novick, S. E. (2007). Microwave spectra and ab initio studies of Ar-propane and Ne-propane complexes: Structure and dynamics. The Journal of Chemical Physics, 127(18), 184306. https://doi.org/10.1063/1.2780775

Publication Title

Applied Physics Letters

DOI

10.1063/1.2400095