Ultraviolet Raman Spectroscopy of Nanoscale Ferroelectric Thin Films and Superlattices


This chapter discusses the advantages of ultraviolet (UV) excitation for Raman measurements of ferroelectric thin films and heterostructures, such as reduced penetration depth and enhanced scattering intensity. Recent results of application of UV Raman spectroscopy for studies of the lattice dynamics and phase transitions in nanoscale ferroelectric structures, such as superlattices based on BaTiO3, SrTiO3, and CaTiO3, as well as ultrathin films of BaTiO3 and SrTiO3 are reviewed. UV Raman experiments are performed on a series of three-component SrTiO3/BaTiO3/CaTiO3 superlattices, focusing on the temperature evolution of the vibrational spectra and the phase transition behavior. In order to investigate the size effect on the ferroelectric phase transitions, variable temperature UV Raman spectroscopy is applied to studies of a series of BaTiO3 films with layer thicknesses varied from 1.6 to 10 nm (4–25 unit cells). UV Raman studies of ferroelectricity in strain-free non-stoichiometric and nominally stoichiometric SrTiO3 films, in combination with dielectric, ferroelectric, nonlinear optical and nanoscale piezoelectric property measurements highlighted the sensitive role of stoichiometry when exploring strain and epitaxy-induced electronic phenomena in oxide films, heterostructures, and interfaces.

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Ultraviolet Raman Spectroscopy of Nanoscale Ferroelectric Thin Films and Superlattices
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Raman Spectroscopy for Nanomaterials Characterization
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  • Challa S. S. R. Kumar (1)
  • Editor Affiliation
  • 1 Center for Advanced Microstructures and Devices, Baton Rouge, LA, USA
  • Authors
  • Dmitri A. Tenne (1_21)
  • Author Affiliation
  • 1_21 Department of Physics, Boise State University, 1910 University Drive, Boise, ID, 83725-1570, USA
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