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

Appl. Phys. Lett. 89, 223130 (2006); doi:10.1063/1.2400095

Published 1 December 2006

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Sarbajit Banerjee, Dae-In Kim, Richard D. Robinson, and Irving P. Herman
Materials Research Science and Engineering Center, Columbia University, New York, New York 10027 and Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027

Yuanbing Mao
Department of Chemistry, Stony Brook University, Stony Brook, New York 11794

Stanislaus S. Wong
Department of Chemistry, Stony Brook University, Stony Brook, New York 11794 and Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, New York 11973
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. ©2006 American Institute of Physics
History: Received 7 August 2006; accepted 22 October 2006; published 1 December 2006
Permalink: http://link.aip.org/link/?APPLAB/89/223130/1
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KEYWORDS and PACS

Keywords
PACS
  • 78.67.Bf
    Optical properties of nanocrystals and nanoparticles
  • 77.84.Dy
    Dielectric, piezoelectric, and ferroelectric niobates, titanates, tantalates, PZT ceramics, etc
  • 78.30.Hv
    Infrared and Raman spectra in nonmetallic inorganics excluding elemental, II-VI and III-V semiconductors and fullerenes
  • 77.80.Dj
    Ferroelectric domain structure; hysteresis
  • 79.60.Jv
    Photoelectron spectra of interfaces; heterostructures; nanostructures
  • 77.22.Ej
    Dielectric polarization and depolarization
  • YEAR: 2006

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ISSN:
0003-6951 (print)   1077-3118 (online)
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