Probing Nanoscale Ferroelectricity by Ultraviolet Raman Spectroscopy

Abstract

We demonstrated that ultraviolet Raman spectroscopy is an effective technique to measure the transition temperature (Tc) in ferroelectric ultrathin films and superlattices. We showed that one-unit-cell-thick BaTiO3 layers in BaTiO3/SrTiO3 superlattices are not only ferroelectric (with Tc as high as 250 kelvin) but also polarize the quantum paraelectric SrTiO3 layers adjacent to them. Tc was tuned by ~500 kelvin by varying the thicknesses of the BaTiO3 and SrTiO3 layers, revealing the essential roles of electrical and mechanical boundary conditions for nanoscale ferroelectricity.

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Document Details

Document Type
Technical Report
Publication Date
Sep 15, 2006
Accession Number
ADA604483

Entities

People

  • A. Bruchhausen
  • A. Cantarero
  • A. Fainstein
  • A. Soukiassian
  • D. A. Tenne
  • J. H. Haeni
  • N. D. Lanzillotti-kimura
  • Ram S. Katiyar
  • V. Vaithyanathan
  • W. Tian

Organizations

  • Pennsylvania State University

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Band Gaps
  • Crystal Lattices
  • Engineering
  • Ferroelectricity
  • Films
  • Lattice Dynamics
  • Materials
  • Materials Science
  • Phase
  • Phase Transformations
  • Raman Spectra
  • Raman Spectroscopy
  • Scattering
  • Spectra
  • Spectroscopy
  • Three Dimensional
  • Transition Temperature

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Quantum Dot Semiconductor Device Photonics and Graphene Optoelectronic Materials and THz Physics.
  • Spectroscopy.

Technology Areas

  • Quantum Computing